Koyo master bearing kit for the GM 8.625 inch 10-bolt rear: carrier and pinion bearings, shims, crush sleeve, pinion seal, nut and ring gear bolts.
A rear-end whine at highway speed in a 1999-2008 Silverado 1500, Sierra 1500, Tahoe, Yukon or Suburban, a hum that started after towing, or a pinion seal that keeps leaking onto the exhaust are the jobs this kit is built for. Motive Gear R10RLMK is the Koyo master bearing kit for the GM 8.6 inch (8.625) 10-bolt rear axle used in those trucks and SUVs. It covers every bearing and setup part for a regear or a noise rebuild, including fresh ring gear bolts, so nothing worn or one-time-use goes back into the axle.
The 8.6 is a semi-float, C-clip axle. Its pinion is carried by a head bearing and a tail bearing held at a set preload by a crush sleeve, with pinion depth set by a shim under the head bearing. The carrier rides on two side bearings, and on this axle the carrier shims sit between the bearing races and the housing, so carrier preload and backlash are set by moving shim thickness from one side to the other. GM replaced the 8.5 with the 8.6 on full-size trucks starting in 1999, and the 8.6 that followed in 2009 changed again, which is why bearing kits are split by year.
Drop the driveshaft and check the yoke for play and roughness by hand. With the truck safely on stands and in neutral, spin a rear wheel and listen at the housing with a stethoscope or long screwdriver. Our whine on acceleration vs deceleration guide helps tell pinion from carrier bearing noise. These trucks run a 4L60E or 4L65E, and transmission noise can sound like the axle, so check our 4L60E noise diagnosis guide and transmission vs differential noise before tearing in. Common 10-bolt failures are covered in the GM 10-bolt problems and rebuild cost guide.
R10RLMK is listed for the GM 10-bolt 8.6 inch (8.625) rear axle from 1999 to 2008. The earlier 1970-1998 8.5 uses different bearings, and from 2009 on Motive moves the 8.625 to a separate kit (R10RLAMK), so a 2009-up truck needs that one instead. To confirm you have an 8.6, check for a 10-bolt cover, then read the axle RPO codes on the glove box sticker or the code stamped on the right axle tube. This kit fits open and G80 locking axles because it is bearings and setup parts only; it does not include gears, a carrier, spider gears or axle bearings and seals. If anything about your axle is unclear, send us the year and VIN.
For a regear, pair this kit with a gear set like the Yukon GM 8.5/8.6 3.42 gear set. If the spider gears or cross shaft are worn, the 8.6 open spider gear set for 30-spline axles goes in during the same teardown.
| Fits | GM 8.625 inch 10-bolt rear axle |
| Part number | Motive Gear R10RLMK |
| Bearings | Koyo tapered carrier, front pinion and rear pinion bearings with races |
| Includes | Carrier and pinion bearings, carrier and pinion shims, crush sleeve, pinion seal, pinion nut, ring gear bolts, thread locker, cover gasket, marking compound and brush |
| Material | Alloy steel |
| Condition | New |
No. The kit is listed for 1999-2008 GM 8.6 inch 10-bolt axles. Motive catalogs the 2009-up 8.625 under R10RLAMK, which uses different bearings.
No. The 1970-1998 8.5 uses its own bearing kit. Count the cover bolts, check the RPO code and compare your old bearing numbers if you are unsure.
Yes, as long as the axle is a 1999-2008 8.6. The kit replaces the bearings and setup parts and works with open or G80 carriers.
Yes. The kit includes ten new ring gear bolts and thread locker. Torque them to 65 ft-lb per Revolution Gear's chart for the GM 8.5-8.6, or follow your gear maker's spec.
Revolution Gear lists 14-19 in-lb of pinion preload with new bearings and .006-.010 in backlash for the GM 8.5-8.6. Verify against the instructions supplied with your gears.
75W-90 gear oil, filled to the bottom of the fill hole. Friction modifier is only needed with a clutch-type posi, not with an open or G80 axle.
