This Allstar Performance ring and pinion gear set is a 3.73 ratio kit for GM 8.5in 10-bolt rear ends. It uses a 27-spline pinion gear and is part of Allstar's 3-Series housing fitment line. The ring and pinion are lapped in matched sets at the factory for quiet operation and consistent tooth contact, and are built for race, street, and off-road use.
Allstar Spec Sheet (PDF) | Allstar Ring & Pinion Instruction Sheet (PDF)
Compatibility
Fits GM 8.5in 10-bolt housings requiring a 3.73 ratio ring and pinion set with a 27-spline pinion, 3-Series housing. Confirm housing size, ratio, and pinion spline count before ordering, as ring and pinion gears are matched sets and are not interchangeable between spline counts or housing sizes.
FAQ
What ratio is this Allstar Performance ring and pinion set?
This is a 3.73 ratio ring and pinion gear set for GM 8.5in 10-bolt rear ends, part number ALL70124.
What housing does this ring and pinion kit fit?
This set fits GM 8.5in 10-bolt rear end housings using a 27-spline pinion gear, 3-Series housing design.
Are the ring and pinion gears matched?
Yes. Allstar Performance ring and pinion gears are lapped in matched sets at the factory for quiet operation, so the ring and pinion in this kit must be installed together as a set.
Does this kit include installation hardware or bearings?
No. This is a ring and pinion gear set only. Bearings, shims, and other installation hardware are sold separately in Allstar's ring and pinion install kits.
What is the pinion spline count on this set?
This set uses a 27-spline pinion gear.
