USA Standard Gear Open Spider Gear Set For Chrysler 8.25in / 29 Spline

Open Differential Spider Gear Set for Chrysler 8.25-Inch 29-Spline Rear Axle

The USA Standard YUKZIKC8.25-S-29 is a complete open differential spider gear set engineered for the Chrysler 8.25-inch rear differential with 29-spline axle shafts. This kit applies to Jeep Cherokee, Dodge Durango, Jeep Grand Cherokee, and other Chrysler-platform vehicles equipped with the 8.25in rear end. YUKZIKC8.25-S-29 provides all side gears, spider gears, cross shaft, and thrust washers required for a complete, correct spider gear replacement. Precision-machined YUKZIKC8.25-S-29 components deliver proper tooth geometry and gear mesh to restore smooth, reliable axle operation.

Key Features

• Complete spider gear set for the Chrysler 8.25in 29-spline open differential
• High-quality steel for extended service life
• Precision machined for correct tooth geometry and proper gear mesh
• Includes 29-spline side gears, spider gears, cross shaft, and all thrust washers
• Direct replacement requiring no modification
• Lifetime limited warranty under the Magnuson-Moss Warranty Act

Specifications

Fitment

What's Included

• 2x side gears (29-spline)
• 4x spider (pinion) gears
• Spider gear cross shaft
• Thrust washers

Frequently Asked Questions

How do I confirm my Chrysler 8.25in is 29-spline?
Remove an axle shaft and count the splines on the inboard end. The Chrysler 8.25in exists in both 27 and 29-spline configurations. Ordering the wrong spline count results in a side gear that will not engage the axle shaft. Verify before purchasing.

What vehicles commonly have the Chrysler 8.25in 29-spline rear axle?
The Chrysler 8.25in with 29-spline axles is found in 1984-2001 Jeep Cherokee XJ, 1993-1998 Jeep Grand Cherokee ZJ (with 8.25in rear), and 1994-2004 Dodge Durango, among other Chrysler MJ and XJ platform vehicles.

Will YUKZIKC8.25-S-29 work in a Chrysler 8.25in with a limited-slip differential?
No. This kit is designed for standard open differentials. Limited-slip Chrysler 8.25in units use a different side gear profile and require a limited-slip-specific spider gear set.

What are the signs of worn spider gears in a Jeep Cherokee or Durango rear axle?
A clunk when transitioning between acceleration and deceleration, binding in tight turns, unequal rear wheel rotation, and metal particles in the gear oil are the primary indicators of worn or damaged spider gears.

Is special tooling required for this installation?
A standard differential carrier removal procedure is required, which includes an axle shaft removal tool, snap ring pliers, and a carrier bearing puller for some applications. Refer to the factory service manual for your specific model year.

What is the warranty on this kit?
USA Standard backs the YUKZIKC8.25-S-29 with a Lifetime Limited Warranty. The Magnuson-Moss Warranty Act provides additional consumer protections for drivetrain rebuild components.

Do I need to replace the spider gear cross shaft if it is not visibly worn?
Inspect the cross shaft for scoring or wear at the spider gear contact areas. If wear is present, replace it. The cross shaft is included in this kit for this reason.

What gear oil does the Chrysler 8.25in use?
The Chrysler 8.25in rear differential uses 80W-90 or 75W-90 GL-5 gear oil. If a Trac-Lok limited-slip carrier is installed, add the required friction modifier. Verify the correct specification in the factory service manual for your model year.

Installation Notes

• Verify side gear spline count is 29-spline before ordering YUKZIKC8.25-S-29 by counting axle shaft splines directly
• Remove the differential carrier from the axle housing per the factory service manual before disassembling the spider gear assembly
• Install new thrust washers from the kit and confirm side gear end play is within the service manual specification
• Apply thread-lock compound to the cross shaft lock pin per the factory specification during reassembly
• Refill with the correct GL-5 gear oil and verify there are no leaks before returning the vehicle to service

California Prop 65 Warning

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.