GM 8.5" 8.6" 10 Bolt 30 Spline Clutch Plate Type LSD Limited Slip Differential

The GM 8.5" 10 Bolt axle, also known as the GM 8.6" axle or GM 10-Bolt, is available in many front and rear axle applications including both solid axle and IFS / IRS configurations. While the GM 8.5" axle features an 8.5" diameter ring gear and the GM 8.6" axle uses a slightly larger 8.6" diameter ring gear, almost everything within the axles is completely interchangeable.

Brand:	Speedmaster
Part Number:	PCE204.1065
Part Type:	Differential Carrier
Aftermarket Carrier Style:	Limited slip
Cover Bolts:	10
Axle Shaft Spline Quantity:	30
Manufacturer of Axle:	GM / Speedmaster
Carrier Material:	Steel
Quantity:	Sold individually.

For 8.5"
The factory 8.5" carrier when installed in a factory 8.5" axle uses Timken bearing part # LM501349 and race part # LM501314.The inner diameter of the bearing is about 1.625" and the outer diameter of the race is about 2.890".

For 8.6"
The factory 8.6" carrier when installed in a factory 8.6" axle uses Timken bearing part # LM603049 and race part # LM603012.The inner diameter of the bearing is about 1.780" and the outer diameter of the race is about 3.060".

Special Case:
When retrofitting an 8.6" carrier (or a locker or a spool or any device that replaces the carrier) into an 8.5" axle, it uses Timken bearing part # LM102949 and race part # LM102911. Essentially, it's an ID of 1.780" (bearing) and an OD of 2.890" (race)