Yukon Gear 8.5in & 8.2in GM Carrier installation Kit

Putting a new differential case into a GM 10-bolt, or chasing a hum from the carrier side of a Camaro, C1500, S10, Tahoe or Monte Carlo rear end? Yukon CK GM8.5 is the carrier installation kit for factory-type carriers in the GM 7.5, 7.625, 8.2 and 8.5 inch axles. It holds only what the carrier side of the job needs: two carrier bearings, their races, and Yukon's "super" carrier shim kit. There are no pinion bearings, crush sleeve or seal in the box, which keeps the price down when the ring and pinion are staying put.

What the carrier kit does in a GM 10-bolt

In every one of these axles the differential case rides on a pair of tapered roller bearings. The cones press onto journals on each side of the case, and the races (cups) sit in the housing bores under the two bearing caps. Shims between each race and the housing do two jobs at once: their total thickness sets side bearing preload, and moving thickness from one side to the other slides the ring gear toward or away from the pinion, which sets backlash. Change the carrier and you are starting both measurements from zero, because a new case never positions the ring gear exactly where the old one did. Having a spread of shim sizes on the bench is what turns that from a parts-store scramble into a one-afternoon job.

Yukon describes the kit as the low-cost route for carrier swaps, such as an open case being replaced with a Positraction unit or a locker, and its technical note is short: it fits OEM carriers. Many aftermarket 8.5 inch carriers are machined with larger bearing journals, and those need the CK GM8.5-HD kit instead. Check your new carrier's bearing callout before you order either one.

Symptoms that point to the carrier bearings

• A steady hum or growl that changes with road speed, not engine speed, and stays about the same on throttle and on coast
• Noise that gets louder in long sweeping turns as load shifts onto one side bearing
• A clunk or extra slack when you go from drive to reverse, from backlash that has opened up as a bearing wore
• Steel fuzz on the cover magnet, or a bearing cage that broke up on teardown
• A worn-out or chattering limited slip that is being replaced, which makes new carrier bearings cheap insurance

How to confirm before you buy

Gear whine that comes and goes between acceleration and deceleration is usually ring and pinion contact, while a bearing is more constant. Our carrier bearing noise guide walks through that split. With the cover off and the axle on stands, rock the carrier by hand: any side play you can feel at the case, roughness when you spin it, or pitting on the cones confirms it. Then identify the axle. The GM 8.5 has a 10-bolt cover, and the GM 8.5 rear end guide covers the common failure points; the smaller 7.5 and 7.625 are covered in our 7.5 / 7.625 guide.

Fitment

Yukon lists this kit for OEM carriers in rear 7.5, 7.625, 8.2 and 8.5 inch GM axles. The fitment covers a long span of vehicles, including 1964-1972 Chevelle, Impala and Pontiac A-body cars with the 8.2, 1970-1981 Camaro and Firebird 8.5 axles, 1982-2002 Camaro and Firebird 7.5/7.625, 1988-1999 C/K1500 trucks, 1995-1998 Tahoe, 1992-2000 Yukon, 1983-2004 S10 and Sonoma, and 1996-2003 Express and Savana 1500 vans with the 8.5. GM ran several axles in the same model year, so read the ID on your axle tag or count cover bolts and measure the ring gear before ordering. If you are not sure which axle you have, send us the year and VIN. You can browse the rest of our axle parts in the rebuild kits section.

Install notes

• Pull the axle shafts (C-clip axles need the cross pin out first), mark the bearing caps left and right, and remove the carrier.
• Pull the old cones with a bearing puller and press the new cones onto the new case, seated fully against the shoulder.
• Start with a shim stack that lets the carrier drop in with light drag, set backlash with a dial indicator, then add preload by thickening both sides equally.
• Run a gear marking pattern before final assembly, and torque the caps in their original positions.
• Refill with 75W-90 gear oil. Limited slip units may need friction modifier; follow the carrier maker's instruction.

If a gear change is part of the same job, pair this kit with a 3.73 Yukon 8.5 gear set and a crush sleeve eliminator for the pinion side.

Does CK GM8.5 fit an Eaton Posi, TrueTrac or Detroit Locker in my 8.5?

Usually not. This kit is built for factory-type carriers. Yukon lists several aftermarket 8.5 carriers, including the Dura Grip, Eaton Posi, TrueTrac and Detroit Locker, as needing the larger bearings in the CK GM8.5-HD kit. Check the carrier maker's bearing callout before you order.

What is in the box?

Two carrier bearings, their matching races, and a carrier shim kit with a range of thicknesses. There are no pinion bearings, crush sleeve, pinion seal, gasket or ring gear bolts.

Will it fit my 7.5 or 7.625 S10 or Camaro axle?

Yes, Yukon lists the same kit for the GM 7.5, 7.625, 8.2 and 8.5 rear axles with factory carriers, including S10 and Sonoma pickups and 1982-2002 Camaro and Firebird. Confirm your axle ID first, because GM used more than one axle in many of those years.

Do I need to reset backlash if I only change the bearings?

Yes. New bearings and races do not stack to exactly the same height as worn ones, so check backlash and preload with a dial indicator and run a gear pattern before closing it up.

What fluid goes back in?

75W-90 gear oil. If the axle has a limited slip, follow the carrier maker's direction on adding friction modifier.