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If you drive a GMC Sierra 3500 HD for towing, heavy hauling, or daily work, the condition of your engine mounts directly affects comfort, drivetrain stress, and long-term reliability. A worn or failing mount can let the engine shift under load, increase noise and vibration, and accelerate wear on related components.This guide covers the top seven engine mounts shortlisted for the Sierra 3500 HD. We focus on mounts that meet the truck's load and NVH requirements and that address common failure modes. Below you will find the selection criteria used, practical buying factors, and answers to frequent owner questions before the detailed product list.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Allucam Engine Motor Mount Set of 2 for 2021-2023 GMC Sierra 2500/3500 HD 6.6L Diesel |  |
| Best Quality Built to a higher standard if you want something more solid | AISIN Hydraulic Engine Motor Mounts (pair) |  |
| Best Value The sweet spot between price and what you get | A-Premium Engine and Transmission Mount Kit, Set of 3 |  |
| Best Budget The cheapest option that still gets the job done reliably | Mardarth Engine Motor Mount A5365HY (Left or Right) |  |
| Highest Rated A top-rated pick with lots of positive feedback | PATEWIN Engine Motor Mount, direct fit for 2007–2014 full-size GM V8s |  |
| Most Popular A crowd favorite that many people choose with confidence | Citumo Engine Motor Mount Kit (3pcs) — Compatible with 2007–2014 Tahoe/Silverado/Suburban/Avalanche/Sierra/Yukon/Escalade |  |
| Best Seller A high-volume bestseller chosen again and again | Mardarth Engine Motor Mounts with Heat Shield, Pair for 2007–2014 Trucks and SUVs |  |
1. Allucam Engine Motor Mount Set of 2 for 2021-2023 GMC Sierra 2500/3500 HD 6.6L Diesel
| Brand Name | Allucam |
|---|---|
| Model Number | EK3850-02 |
| Manufacturer | Engine-partsman, Inc. |
| Part Interchange Info | A20110, A20110 |
| Manufacturer Warranty Description | 5 year Warranty, One Time Replacement |
This Allucam set includes the front left and right motor mounts meant to replace worn factory mounts on 2021–2023 GMC Sierra 2500 HD and 3500 HD with the 6.6L diesel. Installed as direct replacements, the mounts restore engine stability and reduce vibration and noise transferred to the cab during idle, acceleration, and towing. The listing notes compatibility with manufacturer part references A20110 and GP3587 and the parts are presented as factory-spec replacements with a five year one-time replacement warranty. Practical benefits are straightforward: replacing both front mounts together helps rebalance engine support and prevents uneven wear, and the set-based approach saves time sourcing matched pieces. A possible downside is that the product listing offers limited technical detail about materials or internal design compared with OE dealer documents, so buyers who need exact factory-material matches or factory part numbers should confirm fitment before ordering. Overall this is a focused replacement option for owners looking to refresh front motor support and reduce cabin vibration on the specified Sierra diesel trucks.
Best for: Owners who want a direct, matched replacement to reduce vibration and restore engine stability on 2021–2023 GMC Sierra 3500 HD 6.6L diesel trucks and prefer a balanced, practical repair approach.
Less Ideal for: Buyers seeking explicit factory-material verification or those who require dealer-sourced parts with full OEM documentation should consider sourcing from a dealership or OEM catalog instead.
- Sold as a matched pair for front left and right mounts to ensure balanced engine support
- Specified fitment for 2021–2023 GMC Sierra 2500 HD and 3500 HD 6.6L diesel for straightforward replacement
- References common part interchange numbers A20110 and GP3587 to simplify fit checks
- Includes a five year one-time replacement warranty for added post-purchase protection
- Product listing lacks detailed material or internal design specifications compared with factory documentation
Verdict: Choose this matched pair to quickly restore engine stability and cut cabin vibration on 2021–2023 GMC Sierra 3500 HD 6.6L diesel trucks with a single, warranty-backed replacement.
2. AISIN Hydraulic Engine Motor Mounts (pair)
| Quantity | 2 |
|---|---|
| Type | Hydraulic |
| Mount Material | Rubber, Steel |
| Fitment Engines | V8 5.3L, 6.0L, 6.2L |
These AISIN hydraulic engine mounts replace the front left and right motor mounts on compatible GM V8 models and are built to match factory-fit function. They use steel and rubber construction with hydraulic damping to reduce vibration and control engine movement under load, which helps maintain drivetrain alignment and throttle response during acceleration. Installation is straightforward since they are designed as direct replacements and come as a matched pair. For drivers focused on performance, the hydraulic design smooths NVH without overly softening engine control, so you get reduced cabin vibration while preserving a planted feel during launches and towing. The mounts reference common GM part numbers for fitment to Silverado, Sierra, Tahoe, and Yukon V8 applications. Limitations are that these are replacement mounts rather than upgraded performance units tuned for track use, and tire-to-chassis modifications or extreme power increases may reveal their factory-style damping limits.
Best for: Drivers who want a factory-quality replacement that reduces vibration without sacrificing engine feel, especially those restoring stock performance or towing regularly.
Less Ideal for: Enthusiasts building high-power or track-oriented Sierra 3500 HD setups seeking stiffer, competition-grade mounts should consider purpose-made performance options instead.
- Hydraulic design reduces engine vibration while preserving control during acceleration.
- Designed as direct replacements for easier installation and proper fitment.
- Matched pair ensures balanced support and consistent damping left-to-right.
- Steel and rubber construction follows factory-style durability expectations.
- Not a heavy-duty performance upgrade for high-horsepower builds; retains factory-level damping.
Verdict: Choose these AISIN hydraulic mounts if you want a reliable, factory-style replacement that cuts vibration while keeping engine control for a performance-minded daily or towing Sierra 3500 HD.
3. A-Premium Engine and Transmission Mount Kit, Set of 3
| Included Components | Front left engine mount with heat shield; front right engine mount with heat shield; rear transmission mount |
|---|---|
| Material Type | Alloy Steel, Rubber |
| Manufacturer | PremiumpartsWhosale |
| Set Name | Set of Three |
This A-Premium kit supplies the two front engine mounts (each with a heat shield) and the rear transmission mount needed to restore proper engine positioning and vibration isolation on compatible 6.6L V8 heavy-duty trucks. In typical use the mounts take the place of cracked or collapsed factory mounts to reduce engine movement, drivetrain clunking, and cabin vibration during acceleration and at idle. Made from alloy steel with rubber damping elements, the parts aim for a precise fit and long service life; the included heat shields help protect the rubber from nearby heat sources. The set is a practical option for a DIY replacement or a shop-level swap because it bundles the most commonly replaced mount locations. Limitations to consider are that the kit is specific to the listed 6.6L V8 fitment and does not include any hardware beyond the three mounts, so you should verify bolt condition and torque specs before installation. The seller provides a one-year unlimited-mileage parts guarantee that covers the cost of the items but not labor or related expenses.
Best for: Practical buyers who want a bundled replacement to restore factory-style vibration isolation on their 6.6L V8 heavy-duty truck without overpaying for branded OE parts.
Less Ideal for: Those looking for a universal solution for multiple vehicle types or a kit that includes new installation hardware and fasteners should consider other options.
- Includes the two front engine mounts and the rear transmission mount needed for common replacements
- Alloy steel construction with rubber damping designed to reduce vibration and noise
- Front mounts include heat shields to protect rubber elements from engine heat
- Packaged as a set so multiple mount failures can be addressed in one repair
- Fitment is limited to the specified 6.6L V8 heavy-duty model years only and will not work outside that scope
- Does not include additional hardware or new bolts so extra parts may be required during install
Verdict: A cost-effective three-piece replacement kit that gets a 6.6L V8 heavy-duty Sierra back to factory-quality vibration control without buying individual mounts.
4. Mardarth Engine Motor Mount A5365HY (Left or Right)
| Manufacturer Part Number | M-941-1 |
|---|---|
| Material Type | Rubber |
| Mounting Type | Chassis Mount |
| Unit Count | 1.0 Count |
This Mardarth engine motor mount is a budget-friendly replacement designed to secure the engine to the chassis while absorbing vibration through a rubber lining. It fits left or right positions on a range of late 2000s to early 2010s full‑size GM trucks and SUVs and installs in the same location as the factory mount without special adapters. The included heat shield and rubber material help cut down engine harshness and noise transmitted to the cab, which is useful if your original mount has become hard or cracked. Because it is a single-piece aftermarket unit, expect slightly different fit or finish versus a factory part, so take time to check bolt alignment during installation. Practical benefits are straightforward: restored engine stability, reduced vibration, and an inexpensive way to avoid more costly drivetrain damage. This is a sensible option if you need a quick, low-cost replacement and are comfortable verifying fit during installation; buyers seeking an exact factory-match finish or upgraded performance damping may prefer a different choice.
Best for: Buyers looking to repair engine movement and reduce vibration on a tight budget who are comfortable installing or supervising a straightforward replacement part.
Less Ideal for: Drivers seeking an exact factory‑finished part or a performance/upgraded mount for heavy towing or racing should consider higher‑spec options.
- Direct replacement designed for left or right mounting positions
- Rubber lining and heat shield help reduce engine vibration and noise
- Affordable single‑unit option for quick repairs
- Compatible with several late‑2000s to early‑2010s GM full‑size trucks and SUVs
- Aftermarket fit and finish can differ from factory parts so trial fitting may be needed
- Supplied as a single mount so replacing multiple worn mounts requires additional purchases
Verdict: A low-cost, practical replacement that restores engine stability and reduces vibration for late‑2000s to early‑2010s GM full‑size trucks when you need an affordable fix.
5. PATEWIN Engine Motor Mount, direct fit for 2007–2014 full-size GM V8s
| Compatible engines | 5.3L / 6.0L / 6.2L V8 |
|---|---|
| Mounting type | Engine Mount |
| Material Type | Rubber with carbon steel bracket |
| Manufacturer Part Number | 1C3211W |
| Manufacturer | PATEWIN |
This PATEWIN hydraulic motor mount is a one-piece direct replacement intended to restore engine stability and reduce vibration for compatible GM 5.3L/6.0L/6.2L V8 vehicles. It installs where the factory mount has worn and its fluid-filled rubber construction isolates resonance and steering-wheel tremor at idle, while the steel bracket supports engine torque and pitch during acceleration and braking. Typical use is as a straightforward swap for a failed or degraded mount to stop clunks, reduce engine movement, and return a quieter cabin. The mount is built with dense elastomer bonded to structural carbon steel and is powder coated for corrosion resistance. Because it is a single OEM-replacement part, fitment and installation are simpler than multi-piece or aftermarket-performance options, but buyers should confirm exact vehicle fitment and torque specs before installation. This is a practical, durability-focused replacement rather than a performance upgrade, and professional installation is recommended if you lack the tools to safely support the engine during the swap.
Best for: Buyers who prioritize restoring factory-like stability and quiet operation after a worn mount; ideal for owners wanting a durable, direct replacement to eliminate vibration and clunks.
Less Ideal for: Not a good choice for people seeking performance mounts tuned for aggressive driving or heavy aftermarket modifications.
- Direct-fit, one-piece hydraulic design replaces specified factory mount for straightforward installation
- Fluid-filled rubber insulator reduces vibration and steering-wheel tremor at idle
- Structural carbon steel bracket provides durable support for V8 torque and engine pitching
- Powder-coated finish and bonded construction improve corrosion resistance and longevity
- Fitment limited to specific GM V8 models and years so verification is required before purchase
Verdict: Choose this PATEWIN hydraulic engine mount when you need a reliable, factory-style replacement that restores cabin quietness and engine stability.
6. Citumo Engine Motor Mount Kit (3pcs) — Compatible with 2007–2014 Tahoe/Silverado/Suburban/Avalanche/Sierra/Yukon/Escalade
| Unit Count | 3.0 Count |
|---|---|
| Finish Type | Powder Coated |
| Manufacturer | Citumo |
| Model | Engine Motor Mount |
This Citumo three-piece engine motor mount kit replaces worn factory mounts to cut engine vibration and reduce noise on compatible 2007–2014 GM full-size trucks and SUVs. The mounts use rubber isolators bonded to metal housings and are powder coated for corrosion resistance, so they serve as a direct replacement during routine engine-mount service. Installation is typical for motor mounts: support the engine, unbolt the old mount, and fit the new unit; the listing notes a possible heat-shield or bolt alignment issue that may require loosening a nut to seat the part. In practice the kit is a budget-friendly option that restores a firmer engine fit and noticeably fewer vibrations compared with hardened, failing mounts. Expect decent durability for normal driving, though this is an aftermarket unit so fit and long-term wear can vary by vehicle and driving conditions. Buyers should confirm year, engine, and transmission compatibility before purchasing and be prepared for basic shop labor or a competent DIY install.
Best for: A cautious buyer who values social proof and wants an affordable complete mount kit to restore normal engine vibration on compatible GM full-size trucks, with readiness to check fitment and rely on reviews before buying.
Less Ideal for: Drivers seeking a heavy-duty or performance-oriented mount for towing, racing, or extreme-duty use should consider premium or vehicle-specific options instead.
- Sold as a complete three-piece kit for a full motor-mount replacement job
- Powder-coated metal housings help resist corrosion
- Rubber isolators restore vibration damping and reduce engine noise
- Direct-replacement form intended for 2007–2014 GM full-size trucks and SUVs
- Aftermarket fit can require minor adjustment during installation such as loosening a nut or moving a heat shield
- Long-term durability may vary compared with higher-end or OEM mounts
Verdict: A budget-friendly three-piece replacement kit that restores vibration control on compatible 2007–2014 GM full-size trucks while offering a proven, review-backed option for cautious buyers.
7. Mardarth Engine Motor Mounts with Heat Shield, Pair for 2007–2014 Trucks and SUVs
| Manufacturer | Mardarth |
|---|---|
| Item model number | YUKON-ESCALADE-SIERRA-1500-2007-2014 |
| Manufacturer Part Number | M-941-2 |
These Mardarth engine motor mounts are a two-piece replacement set intended to secure the engine and cut down on vibration in compatible 2007–2014 full-size GM trucks and SUVs. The mounts include heat shields and rubber lining that isolate engine movement and help dampen noise and vibration transferred to the chassis. They install in the factory mounting locations as like-for-like replacements and are sold as a matched left/right pair to simplify a simultaneous swap. Practical benefits include reduced driveline shudder and a firmer feel compared with worn mounts, plus the heat shield helps protect the rubber from engine bay temperatures. The product is marketed with a one-year guarantee, which should reassure buyers who want fallback coverage. Limitations are typical for aftermarket mounts: fitment must match the listed applications exactly and buyers seeking an upgraded performance mount for heavy towing or high-horsepower builds may prefer a stiffer, specialty unit instead.
Best for: A cautious buyer who wants a direct replacement set to restore factory-like engine stability and reduce vibration in an older full-size GM pickup or SUV while keeping risk low.
Less Ideal for: Drivers planning high-horsepower upgrades, intense towing beyond stock capacity, or those wanting a purpose-built performance mount should consider specialty options instead.
- Sold as a matched left and right pair for coordinated replacement
- Rubber lining reduces engine vibration and cabin noise
- Includes heat shield to protect the mount from engine bay heat
- Compatible with many 2007–2014 full-size GM trucks and SUVs listed
- Aftermarket fit may require careful verification against vehicle part numbers
- Not a heavy-duty performance mount for high-torque or modified engines
Verdict: A straightforward, factory-style replacement pair that reduces vibration and restores engine stability for risk-averse owners of compatible 2007–2014 GM full-size trucks and SUVs.
Choosing the Right GMC Sierra 3500 HD Engine Mount: Key Factors to Consider
Load Capacity and Shear Strength
Heavy-duty trucks like the GMC Sierra 3500 HD routinely carry high payloads and tow heavy trailers, which places significant static and dynamic loads on engine mounts. A mount with insufficient load capacity will deflect excessively under torque, allowing the engine to shift and stressing transmission and driveline components.
Shear strength in the mounting hardware and any bonded bushings determines how well the mount resists lateral forces during cornering or when the truck shifts under load. Look for mounts with published load or torque ratings and robust bracket designs. Higher-rated mounts help maintain alignment and reduce the chance of premature failure when towing or hauling regularly.
NVH Isolation
Noise, vibration, and harshness matter for driver comfort and perceived vehicle quality. The right mount absorbs and isolates engine vibration while preventing excessive movement under load. Rubber, hydraulic, and fluid-filled mount designs offer different NVH tradeoffs; heavier-duty mounts may prioritize stability over complete isolation.
Consider how you use the truck: if you spend long hours in the cab, prioritize mounts engineered for vibration damping. For work trucks that prioritize raw stability during heavy towing, choose mounts that control motion even if they transmit a bit more vibration at idle.
Material Durability and Environmental Resistance
Mount materials are exposed to heat from the engine, road contaminants, and engine fluids. Rubber compounds should resist ozone cracking and oil swell, while metal brackets need corrosion resistance and fatigue strength. Stainless coatings, plated fasteners, and high-quality bonded rubber extend service life.
A durable mount reduces the frequency of replacements and helps avoid secondary damage to transmission mounts or the exhaust system. Check for materials rated for heavy-duty use and construction details like welded brackets or reinforced housings that handle sustained stress.
Fitment Precision and OEM Compatibility
Accurate fit is crucial for safe installation and long-term function. A mount that lines up with factory mounting points and maintains correct engine position prevents interference with accessories, proper driveline angles, and correct hood and body gaps.
Verify that the mount matches bolt patterns, stud sizes, and clearance envelopes for the Sierra 3500 HD. Even small misalignments can introduce stress concentrations that shorten the mount's life or cause noise and handling issues.
Serviceability and Installation Requirements
Consider how easy the mount is to access and replace on the Sierra 3500 HD. Some mounts require partial engine support, special tools, or the removal of adjacent components such as splash shields or intake parts. Ease of installation affects labor time and the likelihood of correct torqueing during reassembly.
Look for mounts that do not require extensive teardown and that provide clear hardware and torque specifications. When a mount needs alignment after installation, check whether simple on-vehicle procedures are sufficient or whether a shop visit is advisable.
Compatibility With Towing and Performance Modifications
Many Sierra 3500 HD owners add towing upgrades or performance modifications that change engine torque delivery or weight distribution. Ensure the selected mount tolerates altered torque pulses and any additional accessory loads. Some mount designs explicitly accommodate higher torque or aftermarket accessories by using stiffer bushings or reinforced brackets.
If you routinely tow heavy loads, choose mounts rated for increased torque and consider whether auxiliary supports are required. A mount that fails to account for modified loads will shorten service life and can introduce unpredictable vibration or alignment problems.
Understanding Mount Types and Their Tradeoffs
Engine mounts for heavy-duty trucks fall into a few common categories, each with different performance characteristics. Solid or hybrid mounts emphasize control and minimal movement, hydraulic or fluid-filled mounts focus on vibration isolation, and bonded rubber mounts balance cost and function.
For the Sierra 3500 HD, the right type depends on how the truck is used. If towing heavy loads frequently, stiffer mounts that limit engine rotation under torque are often preferable. If driver comfort during long highway runs is the priority, mounts with better NVH damping can make a noticeable difference.
- Solid/hard mounts: greater stability, more vibration transfer
- Fluid-filled mounts: improved damping, can be sensitive to fluid leakage over time
- Bonded rubber mounts: cost-effective, reliable for general use
Common Symptoms That Point to Mount Failure
Recognizing early signs of mount degradation helps avoid collateral damage to the drivetrain. Typical symptoms include increased engine movement under acceleration, clunks during gear changes, and elevated vibration at idle or under load.
Owners should also inspect for visible cracking, separated rubber, or oil contamination on rubber elements, which can accelerate failure.
- Excessive vibration at idle or while accelerating
- Clunking or banging noises when engaging gear or during sudden throttle
- Visible rubber deterioration or metal fatigue
Installation Tips to Avoid Common Mistakes
Proper installation is as important as choosing the right mount. Supporting the engine correctly before unbolting mounts prevents undue stress on other components. Follow torque specifications precisely and tighten bolts in the recommended sequence to maintain alignment.
Inspect surrounding components while the mount is out of the truck. Worn bolts, degraded brackets, or loose accessories can compromise a new mount if left unaddressed.
- Use a secure engine support and rated jack stands
- Replace mounting hardware if threads are damaged or bolts show corrosion
- Torque fasteners to manufacturer's specs and recheck after initial break-in
How Towing and Payload Affect Mount Selection
The Sierra 3500 HD's heavy-duty role means mounts are subject to frequent high torque events and greater static loads. A mount chosen for occasional light-duty driving may not hold up under continuous towing. Evaluate the mount's torque rating and reinforcement if you regularly haul heavy trailers.
Also consider how load shifts in the bed or trailer tongue weight changes affect engine attitude. Maintaining correct driveline angles reduces vibration and prolongs component life.
- Prefer mounts with higher torque or shear ratings for frequent towing
- Consider auxiliary supports or transmission mount upgrades if towing at or near capacity
Maintaining Mounts to Extend Service Life
Regular inspection and preventive maintenance reduce the chance of sudden mount failure. Check mounts for rubber cracks, metal fatigue, and signs of engine fluid contamination during scheduled service intervals. Address related leaks promptly, as oil or coolant can degrade rubber quickly.
If you notice early signs of failure, replacing the mount before it fully separates prevents additional wear to the transmission, driveshaft, and exhaust system.
- Inspect mounts visually every oil change or major service interval
- Repair fluid leaks quickly to protect rubber components
- Listen for changes in vibration or noise that indicate progressive wear
How We Chose the Best GMC Sierra 3500 HD Engine Mount
We evaluated candidate engine mounts for the GMC Sierra 3500 HD using a set of truck-specific, function-driven criteria designed to reflect real-world demands. Key evaluation points included load capacity and shear resistance to ensure mounts can handle heavy towing and payloads without excessive deflection. We checked material durability, with attention to rubber compound quality and metal bracket strength that affect lifespan under heat, oil exposure, and repeated torque cycles. NVH performance was assessed by how well mounts isolate engine vibration from the cab and minimize driveline shock during gear changes and hard launches. Fitment and engineering precision were part of the review: correct bolt patterns, bushing orientation, and clearances to prevent interference with exhaust or accessory components. We also considered serviceability, meaning how accessible the mount is for routine replacement or inspection and whether the design requires special tools.Exclusions: we excluded options that lacked clear specifications for load or material, mounts intended only for lighter pickup variants, and any units that required undisclosed modification to fit the Sierra 3500 HD. The final shortlist reflects mounts that balance durability, NVH control, and practical installation for heavy-duty use.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the most common signs my Sierra 3500 HD needs an engine mount replacement?
Common signs include increased vibration at idle, clunking noises during acceleration or gear changes, and visible rubber deterioration. Oil contamination on the mount or a change in engine position under throttle also indicate a problem.
Can I replace an engine mount on the GMC Sierra 3500 HD myself?
Many mounts are replaceable by a competent DIYer with the right tools and a safe engine support. However, some mounts require partial engine support or removal of nearby components. If you are unsure about torque specs or engine alignment, consult a professional.
How long do engine mounts typically last on a heavy-duty truck?
Service life varies with use, but heavy-duty operation, frequent towing, and exposure to oil or heat can shorten lifespan. Mounts often last several years under normal use, but signs of wear should prompt earlier replacement.
Will a stiffer mount reduce engine vibration completely?
A stiffer mount reduces engine movement under load and can limit certain vibrations, but it may transfer more high-frequency vibration into the cab. There is always a tradeoff between isolation and control.
Do towing upgrades require different engine mounts?
If towing significantly increases torque or changes weight distribution, consider mounts rated for higher loads or reinforced designs. Some owners pair upgraded mounts with other support components to maintain alignment and reduce stress.
What maintenance helps extend engine mount life?
Regular visual inspections, fixing oil or coolant leaks promptly, and replacing worn mounting hardware help extend life. Addressing early vibration or noise prevents secondary damage that can accelerate mount failure.
Final Verdict
Prioritize mounts that match the Sierra 3500 HD's heavy-duty duties: choose robust materials and rated load capacity first, then balance NVH needs with stability. Consider how you use the truck for towing and whether upgrades change torque delivery or weight distribution. Address installation and serviceability up front to avoid alignment problems.Ultimately, selecting a mount that aligns with your towing habits and comfort expectations will reduce vibration, protect drivetrain components, and lower the risk of secondary damage. Focus on durability, proper fit, and correct installation to make a confident choice.
