Yukon Gear Master Overhaul Kit For Chrysler 76-04 8.25in Diff

The Chrysler 8.25 in. rear axle sits under a long list of Mopar trucks and SUVs, including the Jeep Cherokee XJ and Grand Cherokee, the Dodge Dakota and Durango, and lighter Ram 1500s. After years of towing or a set of bigger tires, its bearings start to whine, the pinion seal weeps, and anyone re-gearing needs fresh bearings anyway. The Yukon Gear & Axle YK C8.25-B master overhaul kit is the complete bearing and seal set for rebuilding a 1976-2004 Chrysler 8.25, and it is new with Timken bearings and races.

What the master kit does in a Chrysler 8.25

Two details make the 8.25 different from most axles. First, carrier bearing preload and backlash are set with threaded side adjusters rather than a stack of shims, so the shims in this kit are mainly for pinion depth. Second, the pinion bearings are held at preload by a collapsible crush sleeve, which is why a new sleeve and nut come in the box. The YK C8.25-B contents, as Yukon publishes them, are carrier bearings and races, pinion bearings and races, a pinion seal, a complete shim kit, ring gear bolts, a pinion nut, a crush sleeve, thread locker, marking compound with a brush, and the cover gasket. Axle shaft bearings and seals are not listed, so order those separately if the wheel ends need attention.

Symptoms of a tired 8.25

• A whine on acceleration, on coast, or both, that rises with road speed
• A rumble that does not change with engine speed in neutral, pointing to bearings rather than the drivetrain ahead of the axle
• Clunk or slack felt at the pinion yoke when you rock the driveshaft
• Gear oil on the yoke and driveshaft from the pinion seal
• Chatter in tight turns on Sure-Grip or limited-slip axles, usually worn clutches or the wrong oil

How to confirm before you order

Many Ram, Dakota and Durango owners first suspect the transmission when the rear axle is what is singing. Coast in neutral at the speed where the noise appears: if it stays, the axle or wheel bearings are the likely source. Next pull the cover, drain the oil and inspect it; metallic paste is normal in small amounts, chunks are not. Grab the yoke and check for in-and-out play, then spin the pinion and feel for roughness. If the ring and pinion teeth are pitted or flaked, plan on gears, for example a Chrysler 8.25 4.56 gear set if you are also going to larger tires.

Fitment

Yukon lists the YK C8.25-B for the 1976-2004 Chrysler 8.25 in. differential. The 8.25 is usually identified by its 10-bolt, D-shaped cover with a flat lower edge; the larger 9.25 has a 12-bolt cover. The axle shafts changed from 27 to 29 splines around 1996-1997, which matters for lockers and axles but not for this bearing kit. Chrysler built the 8.25 for decades, so check the axle tag or send us your year and VIN to confirm before ordering. A Koyo-bearing USA Standard ZK C8.25-B kit fits the same axles if budget matters more, and other kits are in our rebuild kits collection.

Install notes

• Mark the side adjusters and bearing caps before loosening them, and read the original pattern with the supplied marking compound.
• Turn the side adjusters with a proper tool such as the Chrysler 7.25/8.25/9.25 side adjuster tool; a punch and hammer chews up the threads.
• Set pinion depth first, then crush the new sleeve slowly while checking rotating torque. Do not back the nut off once preload is reached.
• Coat the ring gear bolt threads with the kit's thread locker and torque them in a star pattern.
• Adding traction? A 29-spline Dura Grip installs during the same rebuild on 1997-and-later axles.
• Refill with 75W-90 gear oil, plus friction modifier if the axle has a clutch-type limited slip.

How do I know I have an 8.25 and not a 9.25?

Count the cover bolts. The 8.25 has a 10-bolt, D-shaped cover; the 9.25 has a 12-bolt cover. The axle tag on the tube is the surest check.

Does the kit include wheel bearings or axle seals?

No. It covers the center section: carrier and pinion bearings and races, pinion seal, shims, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound and the cover gasket.

Does it matter if my axle is 27 or 29 spline?

Not for this kit. The spline count changes the axle shafts and carrier choice, not the carrier and pinion bearings covered here.

Why are there shims if the 8.25 uses side adjusters?

The side adjusters set carrier preload and backlash, but pinion depth is still set with shims behind the pinion bearing race.

Is this the Timken or Koyo version?

The Yukon YK C8.25-B uses Timken bearings and races. The USA Standard ZK C8.25-B is the Koyo-bearing alternative.