GM 10.5" 14-Bolt Fiber Differential Cover Gasket

• Fiber gasket seals the differential cover, prevents gear oil leaks

• Fits GM 10.5" 14-bolt full-floating rear differentials only

• Not the same as GM 9.5" or 11.5" 14-bolt — different bolt patterns

• Fits 3/4-ton and 1-ton GM trucks, vans, and SUVs

A worn or torn differential cover gasket is a common source of gear-oil leaks, and this fiber gasket is a direct replacement sized for the GM 10.5" 14-bolt full-floating rear differential — identified by its 14 cover bolts and 10.5" ring gear diameter. It's built to match the cover bolt pattern and sealing rail of this specific housing for a proper seal.

This gasket does not fit the GM 9.5" 14-bolt or 11.5" 14-bolt differentials, since those use different cover bolt patterns and housing dimensions despite sharing the "14-bolt" name — verify your ring gear diameter and cover bolt count before ordering. It's sold individually as fiber construction, intended for use with your differential's existing hardware and, where preferred, an RTV sealant for added leak protection.

Commonly used on GM 3/4-ton and 1-ton trucks, vans, and SUVs running the 10.5" 14-bolt full-floating differential — service replacement for gasket wear, or as a companion part when installing a new cover.

Applications
Fits GM 10.5" 14-bolt full-floating rear differentials, commonly found on Chevrolet/GMC 3/4-ton and 1-ton trucks, vans, and SUVs, including Chevrolet C20/C2500, C30/C3500, K20/K2500, K30/K3500 (1973-1998), Silverado 2500/2500 HD (1999-2013), Silverado 3500 (1999-2015), Suburban 3/4-ton (1973-2000), Avalanche 2500 (2002-2006), Express 2500/3500 (1996-present), GMC equivalents, and Cadillac Escalade ESV 2500 (2002-2006).

Installation
Verify ring gear diameter (10.5") and cover bolt count (14) before ordering — this gasket will not fit the GM 9.5" 14-bolt or 11.5" 14-bolt differentials. Confirm gasket or RTV sealing requirements and fluid fill level before installation.

Will this fit a GM 9.5" or 11.5" 14-bolt axle?
No — despite sharing the "14-bolt" name, the GM 9.5", 10.5", and 11.5" 14-bolt differentials use different cover bolt patterns and housing dimensions. This gasket fits the 10.5" full-floating axle specifically.

Is the GM 10.5" 14-bolt semi-float or full-float?
Full-floating. This distinguishes it from the GM 9.5" 14-bolt, which is semi-float.

How do I identify my axle before ordering?
Verify your ring gear diameter (10.5") and cover bolt count (14).

Does this come with the cover or hardware?
No — this gasket is sold individually and intended for use with your differential's existing hardware.

What vehicles use this axle?
GM/Chevrolet 3/4-ton and 1-ton trucks, vans, and SUVs, including K20/K30, Silverado 2500/3500, Suburban, Avalanche 2500, Express 2500/3500, and Cadillac Escalade ESV 2500.