This Allstar Performance mini spool is a 28-spline steel mini spool finished in black powder coat, built for GM 10-Bolt 8.5in differential housings. It replaces the spider gears inside the stock 8.5in carrier, locking both axles together for full lockup while retaining the factory ring gear and carrier.
Compatibility: Fits GM 10-Bolt 8.5in housings using the stock carrier and requires matching 28-spline axles. This is a different housing family from the Ford 9in spools in this lineup, and a different case size from the GM 10-Bolt 8.2in mini spool ALL68162.
FAQ
What housing does this mini spool fit?
GM 10-Bolt 8.5in differential housings.
What spline count is this?
28 spline.
What finish does it have?
Black powder coat.
Is this the same as the 8.2in GM 10-Bolt mini spool?
No, that is a different case size (ALL68162); this spool is specifically for the 8.5in GM 10-Bolt housing.
Will this fit a Ford 9in housing?
No, this mini spool is built for GM 10-Bolt 8.5in housings only.

