Crane 13-Bolt Chromoly Diff Cover - GM 14-Bolt Shave

Design Features:

• Provides approximately 1" of additional ground clearance after the required axle housing modification.
• Smooth bottom profile helps the differential slide over rocks and ledges.
• Heat-treated 8620 chromoly steel for strength and impact resistance.
• One-piece cast cover eliminates welded seams and potential weld-related leak points.
• CNC-machined mounting surfaces for precision fitment.
• Recessed mounting bolt heads help protect hardware during off-road use.
• Includes metric and standard mounting hardware for compatible modified housings.
• Designed for custom axle fabrication and serious off-road applications.

Designed for compatible GM 14-bolt axle housings that have been modified for a 13-bolt shave differential cover. Installation requires cutting and modifying the factory housing to match the reduced-clearance cover profile.

Common Applications:

• GM 14-Bolt Axle Shave Conversions
• Custom Rock Crawler Axles
• Rock Bouncers & Competition Buggies
• Tube-Chassis Off-Road Builds
• Heavy-Duty Trail Rigs
• Custom Fabricated Axle Assemblies Using Compatible GM 14-Bolt Housings

Fitment & Installation Notes:

• Requires a compatible GM 14-bolt axle housing.
• Factory housing must be cut and modified for the 13-bolt cover configuration.
• Not a direct replacement for an unmodified factory 14-bolt differential cover.
• Designed to provide approximately 1" of additional ground clearance after modification.
• Features a smooth bottom profile to reduce hang-ups on rocks and obstacles.
• Uses 13 recessed differential cover mounting bolts.
• Metric and standard mounting hardware included.
• Housing modification must be completed accurately to maintain proper cover fitment and sealing.
• Verify the axle housing, cutting requirements, and differential clearance before beginning installation.
• Experienced fabrication and proper differential assembly procedures are recommended.

Builder Note: A factory GM 14-bolt axle is known for its strength, but the large differential housing can become a limiting factor when clearing rocks and ledges. Shaving the bottom of the housing and installing the Crane Axle 13-bolt chromoly cover helps recover ground clearance while creating a smoother surface that slides over obstacles. Accurate cutting, fitment, and sealing are essential to a successful conversion.

What is a 13-bolt differential cover for a GM 14-bolt axle?

A 13-bolt differential cover is designed for a modified GM 14-bolt housing that has been shaved to increase ground clearance. The conversion removes part of the lower factory housing profile and uses a redesigned cover with 13 mounting bolts instead of the original 14-bolt cover arrangement.

How much ground clearance does the Crane Axle 13-bolt cover provide?

The Crane Axle 13-bolt chromoly differential cover is designed to provide approximately 1" of additional ground clearance when installed as part of the required GM 14-bolt housing shave conversion. Actual clearance improvement depends on the completed housing modification.

Does this differential cover bolt directly onto a factory GM 14-bolt axle?

No. This is a DIY shave conversion cover and requires cutting and modifying the axle housing before installation. It is not a direct bolt-on replacement for an unmodified factory 14-bolt differential cover.

Why shave a GM 14-bolt axle housing?

Shaving a GM 14-bolt axle reduces the amount of differential housing hanging below the axle centerline. This improves ground clearance and helps prevent the differential from catching on rocks, ledges, and other obstacles during off-road driving.

What is the Crane Axle 13-bolt differential cover made from?

The cover is manufactured from heat-treated 8620 chromoly steel with a protective coating. Its one-piece cast construction eliminates welded cover seams, while CNC machining provides precise mounting surfaces.

Why does this differential cover have recessed mounting bolts?

Recessed bolt heads help protect mounting hardware from rocks and trail damage. By keeping the bolt heads protected within the cover profile, the design reduces exposed hardware that can be damaged during hard off-road use.

What is the advantage of a one-piece cast differential cover?

One-piece cast construction eliminates welded seams that can become potential leak or failure points under repeated impact. This provides a durable cover design for demanding off-road applications.

Does the Crane Axle 13-bolt cover include mounting hardware?

Yes. The cover includes metric and standard mounting bolts for compatible modified GM 14-bolt housings. Use the correct hardware for your axle application.

Can I install this cover myself?

This is a DIY modification intended for builders experienced with axle fabrication. Installation requires accurately cutting and modifying the differential housing, preparing the mounting surface, and properly sealing the cover. Professional fabrication is recommended if you are unfamiliar with axle housing modifications.

Is this differential cover suitable for rock crawling and rock bouncing?

Yes. The 13-bolt shave design is intended for aggressive off-road applications where ground clearance and differential protection are important. Its chromoly construction, recessed hardware, and smooth lower profile make it well suited for rock crawlers, rock bouncers, and custom competition buggies.

Will this cover fit every GM 14-bolt axle?

No. The cover is intended for compatible GM 14-bolt housings modified for the Crane Axle 13-bolt shave configuration. Verify the exact axle housing and required modification before ordering.