Yukon Gear Dura Grip For 2011+ Chrysler 9.25in Rear

Yukon Gear Dura Grip Limited-Slip Positraction for 2011 and Up Chrysler 9.25in ZF Rear Differential

The YDGC9.25ZF-31-1 is the Yukon Dura Grip clutch-pack positraction designed specifically for the 2011 and newer Chrysler 9.25-inch ZF rear differential using 31 spline axles. This limited-slip unit fits all gear ratios in the 2011 and up Chrysler 9.25 ZF housing found in Ram 1500 pickup trucks, replacing the open differential with progressive torque-biasing capability across all driving conditions. Built with a high-strength nodular iron case, forged 4320 chromoly spider gears, and composite clutch packs, YDGC9.25ZF-31-1 provides smooth traction improvement without the aggressive lockup behavior of a full locker. The unit is fully rebuildable and assembled in the USA.

Features and Benefits

• Fits 2011 and up Chrysler 9.25-inch ZF rear differential with 31 spline axles
• Fits all gear ratios, no ratio restriction
• High-strength nodular iron case for rigidity under load
• Forged 4320 chromoly spider gears cut for maximum tooth strength
• Composite clutch packs provide smooth yet progressive traction bias
• 4-spring design delivers consistent, predictable positraction engagement
• Fully rebuildable; Yukon rebuild kits available separately
• Smooth on-road driving characteristics with meaningful off-road traction improvement
• Assembled in the USA
• Yukon recommends non-synthetic GL-5 gear oil with Yukon LSD additive (part OILADD)
• 1-year limited manufacturer warranty

Vehicle Fitment

Specifications

What's Included

• One (1) Yukon Dura Grip positraction differential assembly (YDGC9.25ZF-31-1)
• Internal spider gears, side gears, springs, and composite clutch pack assembly pre-installed

Frequently Asked Questions

What is the difference between the Chrysler 9.25 ZF (YDGC9.25ZF-31-1) and the older Chrysler 9.25 unit?
The Chrysler 9.25 ZF is the updated rear axle introduced in the 2011 model year Ram 1500, made by ZF. It is a distinct differential design from the earlier Chrysler 9.25-inch axle used in pre-2011 trucks and Durango models. The YDGC9.25ZF-31-1 is specifically engineered for the 2011 and newer ZF version and will not interchange with older Chrysler 9.25 applications.

Will YDGC9.25ZF-31-1 fit my 2015 Ram 1500?
Yes, the YDGC9.25ZF-31-1 fits 2011 through 2018 Ram 1500 models equipped with the Chrysler 9.25-inch ZF rear axle and 31 spline axle shafts. Verify your axle by checking the RPO/build sheet or measuring the ring gear diameter.

What is the difference between the Dura Grip LSD and an automatic locker for this application?
The YDGC9.25ZF-31-1 Dura Grip is a limited-slip differential that biases torque to the wheel with greater traction while still allowing some relative motion between the two rear wheels. This results in smooth, predictable behavior on all surfaces. A full locker would lock both wheels together, providing maximum traction but also more aggressive handling on paved roads.

Does the Dura Grip require a friction modifier?
Yukon recommends adding their LSD additive (part OILADD) to non-synthetic GL-5 gear oil in the Chrysler 9.25 ZF housing when running the YDGC9.25ZF-31-1. Synthetic oil is not recommended as it may cause aggressive or noisy clutch behavior.

Does installing YDGC9.25ZF-31-1 affect my Ram 1500 warranty under the Magnuson-Moss Warranty Act?
The Magnuson-Moss Warranty Act protects you from having your entire vehicle warranty voided solely due to an aftermarket part installation. The manufacturer would need to prove that the YDGC9.25ZF-31-1 specifically caused any warranty claim filed. Consult a legal advisor or your dealer for specifics related to your vehicle.

Can YDGC9.25ZF-31-1 be rebuilt when the clutch packs wear?
Yes, the Dura Grip is fully rebuildable. Yukon offers clutch pack rebuild kits that restore the unit to new performance specifications.

Does this Dura Grip work with all gear ratios in the 9.25 ZF?
Yes, unlike some positraction units that have a gear ratio restriction, the YDGC9.25ZF-31-1 is compatible with all gear ratios used in the Chrysler 9.25 ZF axle.

Will I notice the Dura Grip during normal on-road driving?
The Dura Grip is designed to be smooth and unobtrusive during normal driving. You may notice slight additional resistance during low-speed tight turns, which is a normal characteristic of a clutch-pack limited-slip unit and is not harmful to the differential.

Installation Instructions

1. Raise and safely support the vehicle. Drain the Chrysler 9.25 ZF differential gear oil.
2. Remove the rear axle shafts from both sides to gain access to the differential.
3. Remove the differential cover and gasket. Clean the housing mating surface thoroughly.
4. Mark the bearing caps for exact reinstallation in their original positions.
5. Remove bearing cap bolts and extract the factory open differential carrier with shims and bearings. Keep left and right shim stacks separated.
6. Remove the ring gear from the factory carrier. Inspect ring gear teeth and bolts for wear.
7. Install the ring gear onto the YDGC9.25ZF-31-1 Dura Grip carrier using clean ring gear bolts with thread-lock compound. Torque to Chrysler 9.25 specification (typically 55 to 75 ft-lb).
8. Press original carrier bearings onto the Dura Grip carrier bearing journals, or install new carrier bearings.
9. Install the Dura Grip assembly into the housing with the original shim stacks. Reinstall bearing caps in marked positions.
10. Check and adjust ring gear backlash (typically 0.005 to 0.009 in) and carrier bearing preload. Adjust shims as needed.
11. Verify gear contact pattern with marking compound.
12. Torque bearing cap bolts to Chrysler 9.25 specification. Install a new cover gasket and cover.
13. Reinstall the axle shafts. Fill with non-synthetic GL-5 gear oil and Yukon LSD additive (OILADD) to the proper level.
14. Road test and allow a 500-mile break-in period before heavy towing or off-road use.

Proposition 65 Warning: This product can expose you to chemicals including lead, which is 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.