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If you drive a 2018-present Jeep Wrangler, keeping transmission temperatures in check matters whether you tow, wheel off-road, or tow a trailer. The factory cooler is often marginal under heavy load and sustained low-speed driving, so upgrading to a dedicated transmission cooler can reduce fluid temperatures, lower wear, and help prevent overheating-related failures. This guide covers the top shortlisted transmission coolers selected specifically for the 2018-present Wrangler lineup, including JL and JLU generations, and explains the evaluation criteria used to judge fitment, cooling performance, and installation complexity. Below you will find the best options for different uses, plus clear buying guidance and installation considerations to help you pick the right cooler for your Wrangler and driving style.
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Top Picks at a Glance
| Best Quality Built to a higher standard if you want something more solid | Mishimoto Performance Transmission Cooler for 2018+ Jeep Wrangler JL |  |
| Best Value The sweet spot between price and what you get | A-Premium Transmission Oil Cooler for Jeep Wrangler and Gladiator (select engines) |  |
| Best Budget The cheapest option that still gets the job done reliably | CM COMPRESSOR Transmission Oil Cooler (CM235) |  |
| Highest Rated A top-rated pick with lots of positive feedback | PACIFIC BEST INC. Transmission Oil Cooler Compatible with 2018–22 Jeep Wrangler JL and 2020–22 Gladiator |  |
| Most Popular A crowd favorite that many people choose with confidence | Go-Parts Transmission Cooler Assembly for 2018–2022 Jeep Wrangler |  |
| Best Seller A high-volume bestseller chosen again and again | BARTOO Universal 4-Pass Aluminum Transmission Oil Cooler Kit |  |
1. Mishimoto Performance Transmission Cooler for 2018+ Jeep Wrangler JL
| Fit type | Vehicle Specific |
|---|---|
| Increase in fluid capacity | 83% over stock |
| External tube area increase | 93% over stock |
| Internal fin surface area increase | 195% over stock |
| Manufacturer | Mishimoto |
This Mishimoto transmission cooler is a direct-fit upgrade for 2018-and-newer Jeep Wrangler JL models that increases fluid and surface area to reduce transmission temperatures under load. It installs in place of the factory cooler and is used for highway towing, spirited driving, and off-road crawling where stock cooling can be marginal. The cooler's larger external tube and fin area plus internal fin structures mean more fluid is exposed to airflow, and the 83 percent higher fluid capacity helps buffer heat spikes during long climbs or while towing. In practice reviewers report measurable temperature drops at highway and low-speed conditions, though some owners add a second cooler or pan modification for extreme duty. The unit is polished aluminum and built for longevity, and Mishimoto backs it with a lifetime warranty. Installation requires time and basic tools and may take longer if adding fittings or routing for a second cooler.
Best for: Buyers who prioritize transmission temperature control during towing, off-road use, or aggressive driving and want a vehicle-specific, engineered cooling upgrade that bolts in without major fabrication.
Less Ideal for: Drivers who rarely stress the transmission or those seeking a multi-vehicle universal solution should consider simpler or less specialized options.
- Vehicle-specific direct fit for 2018+ Jeep Wrangler JL for straightforward installation
- Large increase in fluid capacity to reduce temperature spikes during towing and heavy use
- Significantly larger external tube and fin area plus internal fin structures for improved heat transfer
- Polished aluminum construction for durability and corrosion resistance
- Some users still see modest temperature reductions and may need an additional cooler or pan upgrade for the most demanding towing or off-road use
Verdict: If you run heavy loads, tow, or push a 2018+ Wrangler JL hard, this direct-fit Mishimoto cooler is the most practical upgrade to lower transmission temps and protect the ZF 8-speed.
2. A-Premium Transmission Oil Cooler for Jeep Wrangler and Gladiator (select engines)
| Compatible vehicles | Wrangler 2018-2021, Gladiator 2020-2021 (listed engines) |
|---|---|
| Material | Aluminum |
| Manufacturer part number | APOC231 |
| Reference numbers | 19150, CH4050151, 68314791AA |
This transmission oil cooler is a direct-fit aftermarket unit aimed at lowering transmission oil temperatures on compatible Jeep Wrangler and Gladiator models. Constructed from aluminum, it installs in place of the factory cooler to improve cooling capacity and help reduce heat-related wear on transmission components during towing, off-road use, or heavy city driving. The cooler ships without gaskets or seals so expect to reuse factory seals or source replacements during installation. Its relatively slim profile helps with fitment in the factory mounting area while the multiple mounting points shown in the images suggest straightforward bolt-in replacement for the listed engines. The main limitations are fitment specificity and the need to supply seals and possibly additional hardware; do not assume it covers Wrangler/Gladiator variants outside the listed years and engines. For someone wanting a practical cooling upgrade that mirrors factory fit and function, this unit offers a simple, durable aluminum option.
Best for: Buyers who prioritize practical, factory-style cooling improvements for a 2018–2021 Wrangler or 2020–2021 Gladiator and want a straightforward replacement that reduces transmission oil heat during towing or heavy use.
Less Ideal for: Not a good choice for owners of nonlisted model years or engine variants or for those seeking a universal or heavily upgraded high-capacity aftermarket cooler for extreme towing or racing use.
- Aluminum construction for effective heat transfer and corrosion resistance
- Designed to match factory mounting locations for listed Wrangler and Gladiator engines
- Slim profile that eases installation in original mounting area
- Includes manufacturer reference numbers for easy compatibility checking
- Does not include gaskets or seals so additional parts may be required for installation
- Fitment limited to the specific years and engine options listed
Verdict: A practical, factory-style aluminum transmission oil cooler for listed 2018–2021 Jeep Wrangler and 2020–2021 Gladiator engines that lowers oil temperatures with a direct-fit replacement.
3. CM COMPRESSOR Transmission Oil Cooler (CM235)
| Brand | CM COMPRESSOR |
|---|---|
| Model | Transmission Oil Cooler |
| Item model number | CM235 |
| Exterior | Unpainted |
This CM COMPRESSOR transmission oil cooler is a direct-fit style replacement aimed at lowering transmission fluid temperatures on 2018–2023 Jeep Wrangler and Gladiator models. It mounts in front of the radiator or A/C condenser and uses a fin-and-tube design to improve heat rejection during towing, trail driving, or heavy traffic. The cooler is described as corrosion-resistant and fully tested, which suggests it will hold up to regular road use and seasonal exposure. Installation is typical for bolt-on coolers and should be straightforward for a DIYer with basic tools, though expect to route lines and refill fluid. The product focuses on function rather than extra features like integrated thermostatic bypass or braided stainless lines, so buyers get solid cooling performance at a modest spec level. There is a one-year warranty included, but no detailed performance numbers or line fittings are provided, so professional shops may need to supply hoses or adapters for some setups.
Best for: Practical Jeep owners looking to lower transmission temperatures on a budget who prefer a simple bolt-on cooler they can install themselves or have fitted at a shop.
Less Ideal for: Drivers seeking a high-performance, heavy-duty cooling solution with documented CFM or delta-T ratings or integrated thermostatic control should consider purpose-built performance kits instead.
- Designed for 2018–2023 Jeep Wrangler and Gladiator fitment
- Fin-and-tube construction for improved heat rejection
- Corrosion-resistant materials intended for durability
- Sold as a complete cooler unit that supports DIY installation
- No detailed flow or cooling capacity specs provided
- Does not include specific hose fittings or installation hardware details
Verdict: A straightforward, budget-friendly transmission cooler for 2018–2023 Wrangler and Gladiator drivers who want reliable temperature control without premium extras.
4. PACIFIC BEST INC. Transmission Oil Cooler Compatible with 2018–22 Jeep Wrangler JL and 2020–22 Gladiator
| Manufacturer | PACIFIC BEST INC. |
|---|---|
| Manufacturer Part Number | CDOC235 |
| OEM Part Number | 68314791AA |
| Core Dimensions | 21.66 x 4.26 x 4.26 inches |
| Warranty | 1 Year Manufacturer Warranty |
This Pacific Best Inc. transmission oil cooler is a drop-in aftermarket replacement built to match factory fitment for select Jeep Wrangler JL (2018–2022) and Gladiator (2020–2022) models. It installs without cutting or modification and is intended to reduce transmission fluid temperatures during towing or heavy use. The cooler uses industry-standard heat transfer materials and a core sized to provide additional cooling capacity over the stock unit. Practical benefits include easier installation for DIY or shop installs, compatibility verification by VIN, and a one-year manufacturer backing. Expect improved thermal control under load, which can lengthen transmission life when used for trailering or repeated high-load driving. Limitations are that appearance may differ from OEM finishes and buyers should verify fitment with their VIN before ordering since application is specific to the listed model years and engines.
Best for: Buyers who prioritize long-term drivetrain reliability and need a straightforward, vehicle-specific retrofit to reduce transmission temperatures during towing or heavy off-road use.
Less Ideal for: Drivers who want a cosmetic match to factory finishes or those who need a universal cooler for multiple different vehicles without VIN-specific verification.
- Direct-fit replacement designed for listed Jeep Wrangler JL and Gladiator model years, so no modifications required
- Core sized for improved heat transfer compared with many stock coolers to help reduce transmission fluid temperatures under load
- Manufactured to industry standards with materials intended for durability and long service life
- VIN-based fitment verification and vehicle testing claimed to reduce fitment errors
- Finish may differ from pictured item which could affect matching appearance with factory components
Verdict: Choose this model if you want a tested, direct-fit transmission cooler to lower fluid temps and protect the transmission in 2018–2022 Jeep Wrangler JL and 2020–2022 Gladiator use.
5. Go-Parts Transmission Cooler Assembly for 2018–2022 Jeep Wrangler
| Manufacturer Part Number | TOC001-1512765-0956342-AMZN |
|---|---|
| OEM Part Number | 68314791AA |
| ABPA Partslink Number | CH4050151 |
| Fits Years | 2018-2022 Wrangler models |
This Go-Parts transmission cooler assembly replaces the factory cooler on 2018–2022 Jeep Wrangler models and is intended to restore proper transmission cooling after failure or damage. It installs as a direct replacement for OEM number 68314791AA and is used the same way a factory unit is: mounted in the engine bay and plumbed into the transmission fluid circuit to remove heat from the fluid. The listing emphasizes compatibility across many Wrangler trims and engine types within the 2018–2022 range, and the part is presented as a high-quality aftermarket option that meets safety standards. For buyers this means an easier swap compared with universal cooler kits and the convenience of a unit built to the vehicle's original fitment points. Limitations include the usual uncertainty with aftermarket sources about long-term durability versus factory parts and the listing does not include performance upgrades such as larger core capacity or extra cooling lines, so this is best for like-for-like replacement rather than increased cooling for heavy towing or extreme offroad use.
Best for: Buyers who prioritize a confident, risk-conscious replacement that restores factory cooling without modification and who prefer a part that lists direct compatibility across Wrangler trims.
Less Ideal for: Drivers seeking an upgraded cooler for heavy towing, racing, or extreme off-road use who need increased capacity or performance-focused features.
- Direct-fit replacement built to match OEM part number 68314791AA for straightforward installation
- Compatibility list covers a wide range of 2018–2022 Wrangler trims and engines so fitment checking is simpler
- Marketed to meet or exceed factory quality and government safety standards
- Designed as a plug-and-play assembly so no custom mounting or plumbing required
- No specification of core size, cooling capacity, or material details to evaluate performance improvements
Verdict: Choose this Go-Parts assembly when you want a like-for-like, direct-fit transmission cooler replacement for 2018–2022 Jeep Wranglers to restore factory cooling quickly.
6. BARTOO Universal 4-Pass Aluminum Transmission Oil Cooler Kit
| Thread Size | 5/16 |
|---|---|
| Thread Type | NPT |
| Size | 4 Pass |
| Material Type | Aluminum |
This BARTOO 4-pass transmission oil cooler is a compact, universal kit intended to reduce transmission fluid temperature by routing ATF through tube-and-fin cooling passages. The kit includes the cooler, hose, clamps, mounting rods, foam pads and an adapter to connect to 5/16 inch lines, so it can be installed ahead of the radiator or behind a grille opening where there is good airflow. The tube-and-fin design with internal turbulators improves heat transfer and reviewers report large temperature drops in real use. Construction is T-6061 aluminum with polishing for corrosion resistance and the unit is rated for typical automotive pressures and temperatures. Expect straightforward DIY installation but plan to source vehicle-specific fittings or upgrade the supplied hose and clamps for a more secure, long-term connection. This is a practical, budget-friendly way to keep transmission temps in check for towing or spirited driving, though fitment will require checking clearances and line size on your Wrangler before buying.
Best for: Practical owners looking to protect a daily-driven Jeep Wrangler from transmission overheating when towing or driving hard who prefer a low-cost, DIY-friendly cooling upgrade.
Less Ideal for: Buyers who want a vehicle-specific, bolt-in cooler with OEM-style hard lines or those unwilling to modify fittings and routing for a secure installation.
- Compact 4-pass tube-and-fin design improves heat transfer and lowers ATF temperatures.
- Includes basic installation kit: hose, clamps, mounting rods, foam pads and adapter for 5/16 in lines.
- T-6061 aluminum construction resists corrosion and handles typical transmission operating temperatures.
- Universal fit concept makes it adaptable to many installation locations when space and line size allow.
- Included hose and clamps are basic and may need upgrading or double-clamping to prevent leaks.
- Universal fittings mean you may need to purchase vehicle-specific adapters for a clean, permanent installation.
Verdict: A compact, budget-friendly aluminum 4-pass cooler that delivers noticeable ATF temperature reduction for Wrangler owners willing to fit and upgrade the supplied hoses and fittings.
Choosing the Right 2018-Present Jeep Wrangler Transmission Cooler: Key Factors to Consider
Cooling Capacity
Cooling capacity determines how much heat the cooler can remove from transmission fluid during heavy use. For Wrangler applications, look for coolers rated to reduce transmission fluid temperature by a significant number of degrees under continuous load, because elevated fluid temperatures accelerate wear and degrade friction materials. A higher-capacity cooler often means a larger core or more efficient fin design, which improves heat rejection at low vehicle speeds. Consider how you use the vehicle: frequent low-speed rock crawling and towing demand more cooling headroom than occasional highway driving. Also remember that oversized coolers still need adequate airflow to perform effectively.
Fitment and Mounting
Proper fitment is crucial on the Wrangler where front-end geometry and bumper modifications vary between JL and JLU generations. A cooler that mounts cleanly to the bumper support or a bolt-on bracket reduces installation time and avoids interference with skid plates or aftermarket bumpers. Check clearance around the radiator, A/C condenser, and existing transmission lines to ensure the cooler will not rub or be crushed by off-road impacts. Modular mounting options and adjustable brackets help adapt installations between stock and modified front ends.
Connection Type and Included Hardware
Transmission cooler lines and fittings differ by model year and transmission type. Choosing a cooler that comes with the correct adapters, hose ends, or a transmission cooler kit simplifies installation and reduces leak risk. If a kit does not include vehicle-specific fittings, factor in the availability of compatible hose, AN fittings, or quick-disconnect adapters. Secure, properly sized hoses and clamps are essential to maintain fluid pressure and prevent contamination from ingress during service.
Core Construction and Durability
Core material and construction affect how a cooler handles road debris, corrosion, and vibration. Brazed plate or bar-and-plate heat exchangers typically resist impact and corrosion better than loosely finned tube cores, which can be damaged on trails. Protective coatings, durable end tanks, and reinforced mounting points extend service life in harsh environments. Consider the tradeoff between a heavier, more robust cooler and potential space or clearance limitations on the front of the Wrangler.
Airflow and Location
Airflow across the cooler is a major factor in real-world performance. Placement in front of the radiator or A/C condenser maximizes airflow at speed but may be more exposed to off-road damage; placement behind a skid plate or tucked lower reduces exposure but can limit cooling. Some installations pair an external transmission cooler with a fan or relocate the cooler to a higher flow area. Balance the need for protection during off-road use with the requirement for consistent airflow during towing or prolonged climbs.
Serviceability and Maintenance
Plan for maintenance from the start. Transmission coolers can accumulate debris, and lines may need periodic inspection for leaks or wear. Choose designs that allow easy flushing of fluid and accessible hose connections without major disassembly. Also consider long-term replacement availability for hoses, fittings, and mounting brackets so future repairs do not require replacing the entire assembly.
Why Wrangler Owners Upgrade the Transmission Cooler
Wrangler drivers often encounter conditions that push transmission temperatures above what the factory cooler was designed to handle. Towing, low-speed rock crawling, steep climbs, and long periods of stop-and-go driving each place sustained loads on the transmission, making additional cooling useful to preserve service life.
Upgrading the cooler reduces thermal stress on internal components and friction materials. For owners of JL and JLU generation Wranglers especially, an aftermarket cooler can be a preventative modification that lowers the chance of heat-related failures during heavy use.
- Reduces transmission fluid temperature under sustained load
- Improves longevity of seals and friction elements
- Adds thermal margin for towing and off-road use
Choosing Between Inline and Stacked Coolers
Inline coolers mount directly in the transmission line and are compact, making them easier to tuck into confined spaces. Stacked or auxiliary coolers are larger heat exchangers mounted in front of the radiator or bumper and offer higher capacity at the cost of a larger footprint.
For many Wrangler owners, a stacked cooler provides better heat rejection for heavy-duty use. However, if you run aftermarket bumpers or need to preserve front clearance, a compact inline cooler or a combination system with both an inline and auxiliary cooler may be a better fit.
- Inline: compact, easier to hide, lower capacity
- Stacked/Auxiliary: higher capacity, needs mounting space and airflow
Installation Considerations and Typical Time
Installation time varies with the cooler type and whether your kit includes vehicle-specific fittings. A straightforward inline cooler replacement can take one to two hours for someone comfortable with basic hand tools. Larger stacked coolers that require bumper removal or bracket fabrication can take several hours and may benefit from an extra pair of hands.
If you plan to install yourself, prepare by draining some transmission fluid into a clean container, having correct hose sizes and clamps on hand, and protecting exposed components during routing. Following torque specifications on fittings and testing for leaks before finalizing mounting reduces the risk of post-installation issues.
- Simple inline installs: 1–2 hours
- Stacked cooler installs: 2–5 hours depending on bumper and bracket removal
- Always pressure-test and check for leaks after installation
Impact on Transmission Fluid Type and Change Intervals
A cooler itself does not change which transmission fluid your Wrangler requires, but lowering operating temperature can extend fluid life and stabilize friction characteristics. Cooler operation makes fluid less prone to thermal breakdown, which can help maintain consistent shifting behavior over longer intervals.
When upgrading to a higher-capacity cooler, inspect fluid condition during installation and follow the vehicle manufacturer's recommendations for fluid type, topping, and change intervals. In heavy-use cases like frequent towing, consider more frequent fluid checks even if temperatures are reduced.
- Cooler helps preserve fluid, but does not change fluid specifications
- Check fluid condition during install and monitor temperature after first drives
Protecting the Cooler During Off-Road Use
Because the front of the Wrangler is exposed on trails, protecting an auxiliary cooler is important. Consider routing the cooler behind a bumper's integrated guard, installing a slim skid plate, or choosing a cooler with a protective grille to reduce puncture risk from rocks and brush.
Mounting the cooler slightly higher or closer to the vehicle frame can also reduce exposure without severely compromising airflow. Regular inspections after off-road trips let you catch damage early before leaks develop.
- Use protective guards or bumper-mounted positioning
- Inspect for debris build-up and leaks after off-road runs
Still looking for the perfect fit?
Select your Jeep Wrangler configuration to see the most relevant Transmission Coolers recommendations
How We Chose the Best 2018-Present Jeep Wrangler Transmission Cooler
We prioritized options that deliver measurable cooling improvements while fitting the 2018-present Jeep Wrangler chassis and common factory transmission plumbing. Key evaluation criteria included cooling capacity under load, measured as fluid temperature reduction or increased heat dissipation; physical fitment and mounting flexibility for JL and JLU generation frames; compatibility with stock transmission cooler lines and availability of suitable adapter hardware; construction quality, including brazed or bar-and-plate cores and corrosion-resistant finishes; and installation complexity, covering whether a transmission cooler kit includes necessary fittings, hoses, and mounting brackets. We also considered secondary factors such as warranty support, serviceability of the heat exchanger, and how a cooler affects transmission fluid flow and pressure. Exclusions applied to one-size-fits-all universal designs that require extensive custom plumbing unless they offered clear, documented fit solutions for the Wrangler. The resulting shortlist emphasizes products that balance thermal performance, straightforward installation, and long-term durability for typical Wrangler use cases like trail driving, towing, and daily commuting.
Our full evaluation process is outlined in our review methodology.
FAQ
Will adding a transmission cooler change my Wrangler's transmission fluid type?
No. Adding a cooler does not change the required fluid type. It can help fluids run cooler and last longer, but you should continue using the manufacturer-recommended fluid and check condition regularly.
How do I know if my transmission needs an external cooler?
Watch for transmission cooler failure symptoms such as frequent overheating alarms, burnt-smelling fluid, slipping under load, or frequent high-temperature readings during towing. These signs, especially under repeated heavy use, indicate additional cooling could be beneficial.
Is the installation of a transmission cooler difficult for a DIYer?
Difficulty depends on the cooler type. Inline installations that use existing line fittings are typically straightforward for someone comfortable with basic tools. Larger stacked coolers that require bumper removal or bracket fabrication are more complex and may take several hours or need professional help.
Can I use a universal transmission cooler on my 2018-present Wrangler?
You can, but universal coolers often need additional fittings or custom brackets to fit the Wrangler and may increase installation time. Prefer kits that include compatible hardware or documented fitment for the JL and JLU generation to avoid extensive modifications.
Where is the best place to mount an auxiliary transmission cooler on a Wrangler?
Mounting in front of the radiator or behind the bumper where airflow is solid is effective for cooling. Balance that with protection needs on trails by using bumper mounts or protective grilles so the cooler gets airflow but is shielded from rocks.
Will adding a cooler fix slipping or shifting issues?
A cooler can reduce overheating-related slipping by lowering fluid temperature, but it will not correct mechanical issues unrelated to heat. If slipping continues after addressing temperature, further mechanical diagnosis may be required.
Final Verdict
Upgrading the transmission cooling system on a 2018-present Jeep Wrangler is a practical preventative step for owners who tow, off-road, or operate in hot conditions. Prioritize cooling capacity that matches your duty cycle, secure fitment that works with JL and JLU generation front-end layouts, and a connection style that minimizes custom plumbing. Balance capacity against exposure and installation complexity, and plan for periodic inspections after trail or towing use. With the right choice, you will reduce transmission operating temperatures and extend component life while keeping installation and maintenance manageable.
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