Chrysler 8.25 Hardcore Rear Differential Cover YHCC-C8.25

If the stamped cover on your Chrysler 8.25 rear axle is dented, weeping gear oil from a creased flange, or you are about to start wheeling a Cherokee, Dakota, Durango or Ram 1500 over rocks, this is the cover that goes on instead. The Yukon Hardcore YHCC-C8.25 is a thick-walled nodular iron cover with a black powder coat, a stainless accent plate and stainless cover bolts. It weighs 14.7 lb, which tells you how much more metal sits between a ledge and your ring gear than the thin factory stamping.

What the cover does on a Chrysler 8.25

The 8.25 is a Salisbury-style axle: the carrier, ring gear and pinion all live in the center section, and the 10-bolt rear cover is the only thing closing the back of it. It is also the lowest, most forward-facing surface on the axle when you back up or slide off a rock. A factory cover that gets pushed in can touch the ring gear, and a bent flange lets the gear oil seep out until the bearings run dry. A cast cover takes the hit, and because it is far stiffer than a stamping it also braces the open back of the housing, which helps keep the carrier bearing caps from spreading under heavy torque. Yukon also contours the inside so oil thrown off the ring gear moves back across the gears faster.

Symptoms that say the cover needs replacing

• Gear oil film or drips around the cover edge, usually worst at the bottom bolts
• A visible dent or crease in the cover after a trail hit or a curb
• A new tick or scrape that matches road speed, which can be a cover pushed into the ring gear
• Low gear oil found at a fluid change, followed by a whine from dry pinion or carrier bearings
• Stripped or rusted-off cover bolts that will not hold a seal anymore

How to confirm before you buy

First make sure the noise or leak is really the cover. A pinion seal leak runs down the front of the housing, while a cover leak starts at the cover flange; our differential cover leak guide walks through telling the two apart and when RTV alone is enough. If the truck already whines or rumbles, drain the oil into a clean pan and look for metal chunks before buying only a cover. Whine on throttle and coast points to gear or bearing wear, covered in our 46RE noise diagnosis guide, which also shows how to tell an axle noise from a transmission noise in these trucks. If the gears are worn, plan the cover together with an 8.25 master overhaul kit.

Fitment

This cover fits the Chrysler 8.25 inch rear differential with the 10-bolt cover. The 8.25 was used across many Jeep, Dodge and Ram vehicles for decades, but those same vehicles were also built with other rear axles. A Cherokee may have a Dana 35 or a Chrysler 8.25, and Dodge trucks used the 9.25 as well, and none of those share this cover. Check the tag under a cover bolt, count 10 bolts and compare the cover shape before ordering. The Chrysler 8.25 problems and rebuild guide covers axle identification, and you can browse other axle parts in the hard parts category. If you are unsure, send us your year and VIN and we will check it.

Install notes

• Park level, crack the cover loose at the top bolts and pry at the bottom so the oil drains into a pan.
• Scrape the housing flange to bare, clean metal and wipe it with brake cleaner. Any old gasket or RTV left behind is where the next leak starts.
• Use a cover gasket or a thin bead of RTV, then snug the bolts in a cross pattern and torque them evenly.
• Fill through the fill plug until oil starts to run out of the hole. Use 75W-90 gear oil, and add friction modifier if the axle has a clutch-type limited slip such as a Dura Grip posi; our friction modifier guide covers how much to add.
• Recheck the bolts after the first drive, and check the fluid level again after the first trail run.

If the oil coming out has chips in it, replace the worn parts before closing up. For a worn-out 1976-2004 axle, the USA Standard overhaul kit or a fresh 29-spline spider gear set can go in under this cover while the axle is apart.

Will this cover fit a Jeep Cherokee XJ?

Only if the XJ has the Chrysler 8.25 rear axle. Many XJs came with a Dana 35, which uses a different cover. Check the axle tag on a cover bolt and count 10 cover bolts, or send us your year and VIN.

Does it fit a Dodge Ram with the 9.25 rear axle?

No. The Chrysler 9.25 rear uses a larger, different cover. This part is only for the 8.25 inch rear differential.

What gear oil should I use after installing it?

75W-90 gear oil, filled until it starts to run out of the fill hole. If the axle has a clutch-type limited slip, add friction modifier unless the oil already contains it.

Do I need a gasket or RTV?

Either works as long as the housing flange is scraped to clean bare metal first. Use a thin, even bead of RTV or a cover gasket, then torque the bolts in a cross pattern.

Does it come with bolts and plugs?

Yes. The cover comes with high strength mounting bolts, and retail listings for YHCC-C8.25 list a drain plug and fill plug as included.