Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
Speedway Motors Logo
America's Oldest Speed Shop ®


12 Bolt GM Rear End Differential Cover Gasket

SAME DAY SHIPPING! Order within the next 11 hours 50 minutes and receive same day shipping

12 Bolt GM Rear End Differential Cover Gasket

Click image to enlarge



Q & A

What's in the Box

Replace your stock rearend cover gasket with these reusable gaskets.  Made of top-quality materials, these differential cover gaskets are designed to ensure a leak-free seal.

12 Bolt GM Rearend Differential Cover Gasket

- Pressed composite
- Fits GM cover (part number 550-3784)
- 12 bolt GM differentials

You may also be interested in:

1964-72 GM 12-Bolt Rear End Differential Axle Cover
(Part #5503784)

Add some visual attitude to your rear axle with these chrome differential covers. They're stamped from heavy-gauge steel to ward off those pesky oil leaks, and chrome plated for long lasting good looks.

GM 12-Bolt Rearend Differential Cover


  • Most 1964-72 GM corporate axles



GM TH350/TH400 Oil Pan Bolt Kit
(Part #91303806)
                        Chrome bolt set for TH-350 and TH-400 automatic transmission oil pans.