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If your Ford Explorer Sport Trac is showing slip, harsh shifts, or fluid leaks, a transmission rebuild kit can restore smooth operation and extend the drivetrain life. Choosing the right kit matters because kits vary widely in component coverage, fit accuracy, and the quality of seals and friction parts. This guide shortlists the top options for the Sport Trac and explains the practical differences you will face during a rebuild.Each kit we considered includes the essential parts a home mechanic or shop will need, and we evaluate them on fitment, component completeness, and durability. Read on to understand what to check before you buy and how the right kit affects repair time and long-term reliability.
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Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Remco 5R55W/5R55S/5R55N Complete Transmission Rebuild Kit |  |
| Best Quality Built to a higher standard if you want something more solid | TRANSTEC 6R80 Transmission Overhaul Kit (2008–Up) |  |
| Best Value The sweet spot between price and what you get | Celliparts Transmission Rebuild Kit for 5R55W/5R55S/5R55N (4.0L/4.6L) |  |
| Best Budget The cheapest option that still gets the job done reliably | unbrand 6R80 Transmission Rebuild Kit (Model 6R80) |  |
| Highest Rated A top-rated pick with lots of positive feedback | Remco 6R80 Transmission Rebuild Kit — Full Overhaul with Clutches and Filter |  |
| Most Popular A crowd favorite that many people choose with confidence | Novalythix 5R55W/5R55S Transmission Rebuild Kit (5-Speed) |  |
1. Remco 5R55W/5R55S/5R55N Complete Transmission Rebuild Kit
| Brand | Remco |
|---|---|
| Fits transmission | 5R55W/5R55S/5R55N |
| Included components | Clutches, front band, pump bushing, filter |
This Remco rebuild kit supplies the core wear components needed to perform a complete overhaul on 5R55W/5R55S/5R55N transmissions used in many Ford vehicles. The kit includes friction clutches, front band components, pump bushing and a transmission filter to restore internal function and fluid control during a shop-level rebuild. In practice the kit is used alongside disassembly, inspection, and any needed hard parts replacement; it focuses on the consumable components that typically cause slipping, harsh shifts, or low line pressure. The packaging and parts selection are intended for professional rebuilders or experienced DIY technicians comfortable with transmission teardown. Limitations are that the kit does not include pistons or valve body components and fitment must match the listed 5R55 family variants; additional machining or replacement of worn castings may still be required. For someone rebuilding a 5R55-series transmission, this kit covers the common friction and filtration items to get the unit back to serviceable condition.
Best for: Buyers who want a balanced, shop-quality parts kit to rebuild a 5R55-series transmission themselves or to stock for routine rebuilds; suitable for repair shops and experienced DIYers prioritizing completeness of consumables.
Less Ideal for: Drivers seeking a plug-and-play remanufactured transmission or anyone unwilling to perform a full teardown and inspection should consider a reman unit or professional rebuild service instead.
- Comprehensive set of consumables including clutches, front band and filter to address common wear points
- Includes pump bushing which helps restore proper fluid pressure and reduce leaks
- Parts packaged for a full overhaul so multiple components are replaced at once, saving sourcing time
- Does not include pistons, valve body parts, or external machined components so additional purchases may be necessary
Verdict: A practical, shop-oriented consumable kit that supplies the essential clutches, band and filter components needed to rebuild 5R55-series transmissions for a reliable, balanced overhaul.
2. TRANSTEC 6R80 Transmission Overhaul Kit (2008–Up)
| Brand | TRANSTEC |
|---|---|
| Model | 6R80 TransTec Transmission Overhaul Kit 2008-Up |
| Manufacturer | Freudenberg |
| Manufacturer Part Number | 81000564 |
The TRANSTEC 6R80 transmission overhaul kit supplies the internal seals and gaskets needed when rebuilding a 6R80 used in Ford mid- to full-size trucks and SUVs. It is intended for transmission teardown and reassembly work and includes metal seals, gaskets, O-rings, lip seals, and sealing rings to replace worn sealing components that commonly cause leaks and pressure loss. Because the kit focuses on sealing hardware rather than friction components, it is most useful when the transmission's mechanical and hydraulic parts are sound but leaking or when performing a preventative reseal during a rebuild. The ISO-certified manufacturer background suggests consistent part fit and material quality, and the kit's coverage for 2008 and later 6R80 applications simplifies ordering for Explorer Sport Trac owners. Limitations: it does not include clutches, bands, solenoids, or bearings, so a full performance rebuild will require additional parts and possibly machining or valve body work to restore shift quality and holding capacity for aggressive use.
Best for: A buyer rebuilding a 6R80 who prioritizes restoring sealing integrity and preventing leaks during a transmission overhaul on a Ford Explorer Sport Trac.
Less Ideal for: Do not choose this kit if you need a complete performance rebuild that replaces clutches, bands, solenoids, or bearings in addition to seals.
- Complete set of seals and gaskets to address leaks and low-pressure symptoms
- Includes metal seals and lip seals for longevity compared with basic rubber-only kits
- Covers 6R80 transmissions from 2008 and up, matching Explorer Sport Trac fitment
- From an ISO-certified supplier, indicating consistent manufacturing quality
- Does not include friction components, solenoids, bearings, or valve body parts needed for a full performance rebuild
Verdict: Choose this kit when your goal is a reliable reseal and leak-free 6R80 rebuild on a Ford Explorer Sport Trac rather than a full performance component replacement.
3. Celliparts Transmission Rebuild Kit for 5R55W/5R55S/5R55N (4.0L/4.6L)
| Part Numbers | 5R55W 5R55N 5R55S |
|---|---|
| Applications | 4.0L and 4.6L Ford transmissions |
| Package Includes | 1x Transmission Rebuild Kit |
This Celliparts rebuild kit supplies a set of replacement components intended for 5R55W, 5R55S and 5R55N transmissions used in 4.0L and 4.6L Ford applications. It is typically used during a mid-level rebuild to replace worn internal parts rather than swapping the entire transmission. The listing highlights compatibility with Explorer Sport Trac, Mustang, Thunderbird, Lincoln LS, Aviator and Mercury Mountaineer within the specified model years. Practical benefits include a comprehensive parts package aimed at restoring shifting quality and avoiding the cost of a reman or new unit, and the kit is marketed as manufactured to precise factory-spec requirements for fit. Limitations to expect are that the kit does not include labor or fluid and may not cover every hard-to-find internal component for a full teardown depending on vehicle condition, so verification of included pieces against your vehicle's failure mode is necessary. Buyers should also carefully check part numbers and pictures to confirm exact fit before purchasing.
Best for: A hands-on owner or independent mechanic looking to restore shifting performance on a 4.0L or 4.6L Ford transmission while minimizing cost compared with buying a remanufactured unit.
Less Ideal for: If you want a turnkey replacement or cannot verify the exact failed components, a fully remanufactured transmission or professional shop service may be a better fit.
- Covers common 5R55W/5R55S/5R55N rebuild needs for 4.0L and 4.6L Ford transmissions
- Marketed to factory-spec tolerances for a close fit to original components
- Includes a broad set of internal parts so you can address typical wear items during a rebuild
- Does not include transmission fluid, gaskets beyond listed pieces, or labor for installation
Verdict: A cost-conscious rebuild kit that lets a practical DIYer or independent shop restore a 5R55-series 4.0L/4.6L transmission without replacing the entire unit.
4. unbrand 6R80 Transmission Rebuild Kit (Model 6R80)
| Brand | unbrand |
|---|---|
| Item model number | 6R80 |
| Manufacturer Part Number | RIHD002681 |
| Date First Available | November 14, 2019 |
This 6R80 transmission rebuild kit supplies the internal components needed to overhaul a worn 6R80 unit. It is sold as a kit matching the 6R80 model number and is typically used by home mechanics or independent shops rebuilding transmissions on compatible Ford vehicles. The kit’s main benefit is that it bundles many replacement parts in one purchase, which simplifies sourcing when doing a teardown and rebuild. Because the listing focuses on fitment to the 6R80 family, installers should verify exact vehicle and transmission variants before starting work. The kit appears to be a budget-oriented option from a third-party brand, so buyers should expect economy-level packaging and parts compared with higher-end rebuild kits. For routine rebuilds where cost control matters and the installer plans to inspect and selectively replace parts, this kit can be a practical way to refresh a 6R80 transmission without buying individual components.
Best for: Buyers who prioritize lower cost and want a single kit to cover most common internal parts during a 6R80 transmission rebuild, and who are comfortable inspecting parts and supplementing with replacements if needed.
Less Ideal for: Shops or owners seeking a premium, fully specified overhaul kit with OEM-equivalent parts and detailed component lists should consider higher-end options.
- Bundled replacement parts reduce the need to source multiple components separately
- Specifically labeled for the 6R80 transmission for clearer fitment direction
- Accessible option for budget-conscious rebuilds and DIY mechanics
- Listing provides minimal detail about exact components included or material quality
Verdict: A cost-focused 6R80 rebuild kit that bundles common internal parts to help budget-minded DIYers and small shops complete a transmission overhaul.
5. Remco 6R80 Transmission Rebuild Kit — Full Overhaul with Clutches and Filter
| Manufacturer | REMCO |
|---|---|
| Brand | Remco |
| Fits | 6R80 transmissions (listed Ford models) |
This Remco 6R80 rebuild kit supplies the major components needed to rebuild a 6R80 automatic transmission, including a clutch pack, shallow-pan filter, overhaul gasket kit, and a complete set of seals and gaskets. It is intended for shop or experienced DIY use during a full transmission overhaul on compatible Ford vehicles. Notable features include a Raybestos clutch pack and a precision overhaul gasket kit, which help restore sealing integrity and clutch function after wear. The included shallow pan filter suits later shallow-pan applications and the kit groups most common wear parts so you do not need to source each item separately. Expect better shift firmness and reduced leaks when the kit is installed correctly, but installation requires transmission disassembly and attention to torque and piston clearances. The kit does not include pistons or detailed vehicle-specific instructions, so professional installation or solid transmission experience is recommended if you are not confident doing a rebuild yourself.
Best for: Buyers prioritizing long-term reliability who plan a complete 6R80 transmission rebuild on a Sport Trac or similar Ford vehicle and prefer a kit that groups quality clutch and sealing components.
Less Ideal for: Casual do-it-yourselfers seeking a drop-in repair or owners who need a plug-and-play replacement transmission without disassembly.
- Comprehensive set of seals, gaskets, and wear components for a full overhaul
- Includes a Raybestos clutch pack known for consistent friction materials
- Precision overhaul gasket kit improves long-term sealing and leak prevention
- Shallow-pan filter included to match later 6R applications and simplify sourcing
- Does not include transmission pistons so additional parts may be needed for some failures
- Installation requires transmission teardown and technical know-how
Verdict: Choose this Remco 6R80 overhaul kit when you need a reliability-focused, comprehensive parts package to do a full transmission rebuild on a compatible Ford vehicle.
6. Novalythix 5R55W/5R55S Transmission Rebuild Kit (5-Speed)
| Brand | Novalythix |
|---|---|
| Model | 5R55W-5R55S Rebuild Kit |
| Exterior | Machined |
| Position | Inside |
| OEM Part Number | 5R55S, 5R55W |
This Novalythix rebuild kit supplies the internal sealing and friction components needed to refresh a 5R55W/5R55S 5-speed transmission. It is typically used during a tear-down and rebuild to replace worn seals, gaskets and clutch packs that cause slipping, leaks, or poor shift quality. The package includes seals, gaskets, friction plates and steel plates in a machined finish, so you get the core consumables a technician needs to restore hydraulic integrity and clutch engagement. For a Sport Trac or other compatible Ford vehicles, the kit helps avoid sourcing individual parts and can cut rebuild time by providing matched components. Important limitations are that this is a parts kit only and does not include bearings, special tools, or valve body components, so expect to supplement it for a full overhaul and to verify exact part numbers against your transmission before purchase.
Best for: Independent mechanics or DIYers rebuilding a 5R55W/5R55S transmission who prioritize having a consolidated parts kit to speed repairs and rely on peer feedback when choosing replacement components.
Less Ideal for: Someone seeking a complete drop-in remanufactured transmission or a kit that includes all internal hardware and valve body components.
- Includes seals, gaskets, friction plates and steel plates needed for clutch and seal replacement
- Machined exterior components suggest consistent fit and finish for internal parts
- Designed specifically for 5R55W/5R55S 5-speed transmissions used in applicable Ford models
- Consolidates common consumables into one kit to simplify sourcing during a rebuild
- Does not include bearings, snap rings, or valve body parts so additional components may be required
- Fitment requires careful cross-checking of part numbers and vehicle compatibility before installation
Verdict: If you are rebuilding a 5R55W/5R55S transmission on a Sport Trac or similar Ford and want a single kit of seals and clutch plates to simplify the job, this kit provides the core consumables you need.
Choosing the Right Ford Explorer Sport Trac Transmission Rebuild Kit: Key Factors to Consider
Component Coverage
A comprehensive kit should include all wear items you will reasonably replace during a rebuild. That normally means friction and steel clutch packs, bushings or thrust washers if required, valve body gaskets, pan gaskets, filters, and a full set of seals. Missing components force additional orders and can lengthen shop time.
When evaluating coverage for the Sport Trac, check that the kit lists compatibility with the exact transmission variant and that it supplies both internal friction materials and external gaskets. Comprehensive kits reduce the risk of repeat disassembly and are often more cost-effective when you factor in labor time and vehicle downtime.
Seal And Gasket Quality
Leaks are a common cause of transmission problems, so the quality of seals and gaskets in a rebuild kit is critical. Look for materials rated for transmission fluid exposure and designed to resist swelling or hardening over time. Properly made seals help maintain line pressure and prevent early failures.
For the Sport Trac, select kits that include OEM-equivalent or improved material seals for the pan, multiple cover plates, and shaft seals. Inferior seals can lead to drivability issues and may negate the benefits of replacing mechanical components.
Friction Material And Steel Components
Clutch friction material and matching steel plates determine shift feel and durability. Higher-quality friction blends resist glazing and wear, while hardened steel plates maintain flatness and mating surfaces under heat. Poorly manufactured friction packs can cause slipping or inconsistent engagement.
Confirm that friction materials are specified for automatic transmissions if your Sport Trac has an automatic transmission. For manual-type rebuilds, ensure clutch facings meet torque and heat-handling expectations. The right combination controls shift firmness and long-term performance.
Fitment And Compatibility
Fitment accuracy matters more than product branding because incorrect parts lead to extra work and potential damage. Verify the kit explicitly lists the Ford Explorer Sport Trac and the relevant transmission code or application notes when available. Accurate fitment reduces the chance of missing or incorrect components during assembly.
Also consider whether the kit is intended for a particular mileage range or rebuild depth. Some kits are designed for light refreshes while others are full overhauls that replace bushings and hardened wear parts. Choose the scope that matches the condition of your transmission.
Included Hardware And Instructions
Small hardware items like snap rings, pressure regulator springs, bolts, and alignment dowels are easy to overlook but essential during a rebuild. Kits that include necessary hardware and clear installation instructions will save time and reduce the likelihood of returns or failed installs.
For DIYers, step-by-step notes and torque specifications tailored to the Sport Trac transmission are particularly valuable. Shops will appreciate kits that minimize the need to chase incidental parts mid-repair.
Warranty And Support
A reliable warranty signals confidence in the components and offers protection if a manufactured part fails prematurely. Look for warranty terms that cover transmission components for a reasonable period and that specify coverage for seals and friction materials.
Also consider the manufacturer's technical support and availability of replacement pieces if you discover a missing item. Good support can make a challenging rebuild smoother and reduce downtime for your Sport Trac.
Understanding Your Sport Trac Transmission Layout
Before purchasing a rebuild kit, identify the Sport Trac transmission layout and which assemblies are most likely worn. Knowing whether your vehicle exhibits transmission slipping, harsh engagement, or leaks helps you choose a kit that addresses the specific failure modes. A basic inspection of the pan, filter debris, and fluid condition provides valuable clues about internal wear.
Inspect the pan magnet for metal particles, check for burned fluid color, and note any external leaks. Those observations inform whether you need a pan gasket and filter replacement or a full internal rebuild with friction packs and valve body seals.
- Check pan and filter debris color and quantity
- Note external fluid leak locations
- Record symptom timing such as warm-versus-cold shifts
Kit Types: Refresh Versus Full Overhaul
Rebuild kits vary from simple refresh kits that include filters, pan gaskets, and a few seals to full overhaul kits that replace clutch packs, bushings, and valve body components. Choose a refresh kit only if your inspection shows limited wear and no significant clutch material loss. For broader symptoms such as slipping under load or grinding during gear changes, a full overhaul kit is usually warranted.
Assess the cost-benefit of each approach relative to labor. A full overhaul may take longer but can prevent a repeat job in the near term, especially if the Sport Trac has high mileage or a history of transmission problems.
- Refresh kits: minor leaks and routine maintenance
- Full overhaul: slipping, severe debris on the filter, or major wear
Preparing For Installation
Gather the right tools, workspace, and reference materials before starting. Clean work area, recommended torque wrenches, and a reliable service manual for the Sport Trac transmission are essential. Drain the fluid and inspect the filter and pan for debris before deciding on a kit scope.
Label parts and take photos during disassembly to ensure correct reassembly. If you are unsure about any step, plan to consult a transmission specialist, since incorrect assembly or missing shims and springs can cause immediate drivability issues.
- Use a factory service manual or reliable build sheet
- Have replacement fluid and torque specs on hand
- Work on a level surface and clean the transmission exterior before opening
Common Renewal Parts And Why They Matter
Certain parts are almost always replaced during a rebuild because they wear out or fail under heat and pressure. These include friction clutches, steels, rear seals, solenoid or valve body gaskets, and pan gaskets. Replacing these items restores hydraulic function and prevents leaks that undermine pressure.
Pay special attention to the quality of pressure regulator components and input/output shaft seals, as failures here can lead to loss of pressure and rapid re-failure. A kit that covers these common weak points typically yields a more dependable repair for a Sport Trac.
- Friction packs and steels restore engagement surfaces
- Seals and gaskets prevent pressure loss and external leaks
- Valve body gaskets ensure correct hydraulic routing
Tools And Shop Considerations
A proper rebuild requires specific tools such as clutch spring compressors, snap ring pliers suitable for transmission rings, and a torque wrench calibrated for transmission fasteners. Specialized tools help avoid damage to delicate components and ensure proper torque on critical bolts.
If you are hiring a shop, discuss the kit contents ahead of time and confirm they will use the supplied parts rather than substituting incompatible components. Ensure the shop documents the condition of replaced parts so you know why each component was changed.
- Essential tools: snap ring pliers, clutch compressors, torque wrench
- Confirm shop will use the included kit parts and follow Sport Trac specs
Still looking for the perfect fit?
Select your Ford Explorer configuration to see the most relevant Transmission Rebuild Kits recommendations
How We Chose the Best Ford Explorer Sport Trac Transmission Rebuild Kit
Our selection focused on items that provide complete fitment and durable service for the Ford Explorer Sport Trac transmission. We prioritized kits that include the core mechanical components needed for a proper rebuild, such as friction and steel clutch packs, valve body gaskets, seals, and hardened hardware. Fit accuracy was a top filter to reduce installation time and avoid additional sourcing for missing parts.We evaluated component coverage, material quality for friction materials and seals, and whether the kit included critical wear items commonly replaced during an overhaul. Ease of installation and compatibility with the Sport Trac's transmission housings were assessed based on manufacturer compatibility notes and typical repair procedures. Long-term durability considerations included the quality of sealing surfaces and whether steel components met expected tolerances.Excluded from consideration were partial kits that only provide filters or gaskets without clutch packs or seals, and offers lacking clear fitment data for the Sport Trac configuration. Final picks balance completeness, material standards, and practical repair needs for this vehicle.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Sport Trac needs a rebuild kit or just a fluid change?
If you only have dark fluid and no drivability issues, a fluid change and filter replacement may suffice. Rebuild kits are usually needed when you notice slipping, harsh or delayed shifts, metal debris on the pan magnet, or persistent fluid leaks.
Can I install a transmission rebuild kit at home for the Sport Trac?
Many experienced DIYers can perform a rebuild with the right tools and a service manual, but it is a complex job. Proper tools, clean workspace, and attention to torque and assembly order are essential. If you are unsure, professional help avoids costly mistakes.
Will a rebuild kit fix transmission leaks on my Sport Trac?
A full kit that includes seals and gaskets can stop leaks originating from replaced components. However, external case cracks or damaged mounting surfaces may require additional repairs to eliminate leaks completely.
What inspection steps should I follow before buying a kit?
Drain the fluid and inspect the pan for metal particles and burnt residue. Check for external leaks and note shifting behavior when warm. These observations help determine whether you need a refresh kit or a full overhaul.
How long does a typical rebuild take for the Sport Trac transmission?
A professional shop typically completes a full rebuild in one to three days depending on parts availability and any additional repairs needed. DIY timelines vary widely based on experience and access to tools.
Are there parts I should always replace during a rebuild?
Yes. Clutch friction packs, seals, gaskets, and the filter are commonly replaced because they wear and affect hydraulic pressure and engagement. Replacing these items helps restore reliable shifting and reduce the chance of early rework.
Final Verdict
Prioritize kits that match the Sport Trac transmission layout and that include complete coverage of friction packs, seals, and valve body gaskets. Tradeoffs are mainly between a simpler refresh kit that addresses leaks and filters and a full overhaul that replaces all internal wear items. Choose the kit scope based on your inspection findings, symptoms, and whether you prefer to minimize future labor.When in doubt, opt for the more comprehensive kit that supplies required hardware and higher-quality seals. That approach reduces the chance of repeat work and delivers more consistent shift quality for your Ford Explorer Sport Trac.
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