Drivetrain Differentials and Rear-End Components

USA Standard (Yukon)

Posi for 8.5in Oldsmobile 28 Spline 12 bolt (factory 3.08 or 3.23 or Richmond Gear Ring and Pinions

$999.00

SKU: U018 ZP PGM8.5O-3-28

In Stock
In Stock
Ships by Jun 21
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

This differential is designed for an 8.5-inch Oldsmobile rear end, featuring 28-spline axles and a 12-bolt cover. It is a posi-traction unit.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandUSA Standard (Yukon)
Part NumberU018 ZP PGM8.5O-3-28

Videos

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy