Yukon Gear Master Overhaul Kit for Toyota 8in Differential (1986 and Newer, OEM R&P)

Yukon Gear YK T8-B Master Overhaul Kit for Toyota 8in Differential (1986 and Newer, OEM R&P)

The YK T8-B is a complete rebuild kit engineered for the Toyota 8in differential in vehicles from 1986 and newer that retain the factory OEM ring and pinion gear set. Covering the Toyota 4Runner and Pickup through the mid-1990s, the YK T8-B delivers Timken bearings, precision shims, all seals, and the hardware required for a full professional-grade overhaul. When noise or wear signals it is time to restore your Toyota's rear differential, the YK T8-B complete rebuild kit provides everything needed in one convenient package.

Features and Benefits

• Genuine Timken carrier bearings and pinion bearings matched to 1986-and-newer Toyota 8in specifications
• Precision shim sets for accurate pinion depth and carrier preload setup
• OEM-quality pinion seal and axle seals to prevent gear oil leaks
• Specifically calibrated for use with OEM Toyota ring and pinion gear sets (not aftermarket)
• Ring gear bolts, pinion nut, and crush sleeve included for a full hardware refresh
• Gear marking compound and brush for verifying contact pattern during setup
• Thread-locking compound for ring gear bolt installation
• Differential cover gasket included for a clean, leak-free reinstall
• All components sourced and packaged by Yukon Gear for guaranteed quality and fitment

Fitment

Specifications

What's Included

• Timken carrier bearings with races (2 sets)
• Timken pinion bearings with races (front and rear)
• Pinion seal
• Axle seals (pair)
• Complete pinion depth shim set
• Complete carrier shim set
• Ring gear bolts
• Pinion nut
• Crush sleeve
• Thread-locking compound
• Gear marking compound with brush
• Differential cover gasket

Frequently Asked Questions

Q: What is the difference between YK T8-A and YK T8-B?
A: The YK T8-B is designed for 1986 and newer Toyota 8in differentials retaining the OEM ring and pinion. The YK T8-A covers 1985 and older units, or any year with an aftermarket ring and pinion installed.

Q: Does this kit work if I am installing an aftermarket ring and pinion?
A: No. If you are installing an aftermarket ring and pinion, use the YK T8-A instead. The YK T8-B complete rebuild kit is calibrated for OEM ring and pinion gear sets.

Q: Are the bearings in this kit genuine Timken?
A: Yes. The YK T8-B includes genuine Timken bearings and races for both carrier and pinion positions.

Q: Will this kit void my Toyota warranty?
A: Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your powertrain warranty solely because an aftermarket rebuild kit was used. Warranty denial requires proof the aftermarket part caused the failure.

Q: Does the YK T8-B include a crush sleeve and pinion nut?
A: Yes. The YK T8-B includes a new crush sleeve, pinion nut, ring gear bolts, and all seals needed for a complete overhaul.

Q: What Toyota vehicles does this kit fit?
A: The YK T8-B fits the Toyota 4Runner from 1984 to 1995 and the Toyota Pickup from 1986 to 1995 with the OEM Toyota 8in differential and OEM ring and pinion.

Q: Is gear oil included?
A: No. Gear oil is not included. Use the gear oil type and quantity specified in your Toyota service manual when refilling the differential.

Q: Is professional installation required?
A: Differential rebuilds require precise preload and backlash settings. Professional installation or experienced DIY work with proper tooling is strongly recommended to ensure proper operation.

Installation Instructions

1. Drain the differential gear oil and remove axle shafts per the Toyota service manual.
2. Remove the differential cover and thoroughly clean both mating surfaces.
3. Remove the carrier assembly and inspect the housing for wear, scoring, or damage.
4. Remove the pinion shaft assembly and note original shim stack thickness for reference.
5. Press off old pinion bearings and install the new Timken pinion bearings from the YK T8-B kit.
6. Use the included shim set to set the correct pinion depth and confirm with a dial indicator.
7. Press new carrier bearings and races onto the carrier.
8. Install the carrier, set backlash to Toyota specification, and verify contact pattern using the included marking compound.
9. Apply included thread-locking compound to ring gear bolts and torque to specification.
10. Install the new pinion seal; torque the pinion nut to achieve the correct bearing preload.
11. Install new axle seals, reinstall axle shafts, and torque all fasteners to spec.
12. Install the differential cover with the new gasket and fill with the correct Toyota-spec gear oil.
13. Road test and inspect for leaks after the initial break-in period.

California Proposition 65 Warning: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer, birth defects, and other reproductive harm. For more information, visit www.p65warnings.ca.gov.