Drivetrain› Differentials and Rear-End Components

Auburn Gear

GM 12 BLT 4 SER CAR 4.10&UP 30T 65-

$915.80

SKU: A027 546031

In Stock
In Stock
Ships by Jun 10
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

SAME DAY SHIPPING (if ordered before 2pm EST) Auburn Grip-N-Loc Differential. Application: GM 12 Bolt 4-Series. Ring Gear Diameter: 8.875″. Carrier: 4 – Series (4.10:1 and numerically higher). Side Gear Spline: 30 Teeth. Model Years: 1964-1972. Bearing Cone: LM603049. Bearing Cup: LM603012. NEW Grip-N-Loc™ Limited Slip Differential: Built to exceed your expectations. Welcome to Auburn Gear’s most advanced limited slip differential, the Grip-N-Loc™. It builds upon exclusive technologies previously found in our limited slip line, but is even more robust to satisfy the extreme demands of serious drivers. If you push the limits of performance and traction, perhaps through competition, or simply through extreme weather driving, Grip-N-Loc™ is your best choice.

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

BrandAuburn Gear
Part NumberA027 546031

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