Clear Polycarbonate GM 12-Bolt Truck Differential Cover

Clear Polycarbonate GM 12-Bolt Truck Differential Cover

$199.00
$199.00
Sold Out

Fill Port: No Fill Port

A crystal-clear view into your rear differential, built for strength and clarity. Formed from rugged .187" thick polycarbonate, this cover brings unmatched visibility and durability to your axle setup — perfect for inspection, show builds, or just proving a point.

Made in the USA - thermoformed in-house by Legacy Form USA

Fits GM 12-Bolt Truck Rear Axles with 8.875" ring gear.

  • Compatible with GM 12-bolt truck rear differentials commonly found in Chevrolet and GMC pickups, Blazers and Suburbans from the 1960's through the early 1980's.

Common factory applications include:

  • Trucks/SUVs: C10, C20, K10, K20 pickups ('63-'82), Blazer and Jimmy ('69-'82), Suburban ('63-'82), and other GM light-duty and medium-duty truck applications equipped with the factory 12-bolt rear axle.
  • This cover is designed for the GM truck 12-bolt differential featuring the distinctive 12-bolt rear cover used in Chevrolet and GMC truck applications.
  • *This cover does not fit passenger car 12-bolt differentials. Verify cover shape and bolt count on your differential cover before ordering.*

What's In The Box?

  • One .187" thick, oleophobic ceramic coated polycarbonate differential cover
  • G1/4 bulkhead fitting and plug installed
  • Clear RTV Silicone
  • 12"x12" microfiber towel
  • Installation and care instructions

Care Guide:

DO:
Use soft microfiber cloth (included)

Clean with water + mild dish soap

Blow off dust with clean compressed air before wiping (if available)

DO NOT:
Use harsh solvents (e.g. acetone, brake cleaner, etc.)

Use glass cleaners with ammonia

Pressure wash up close or hit with hot degreaser

Scrub with paper towels or abrasives

The UV and oil-resistant coating is tough, but not indestructible

12-Month Warranty

  • Covers manufacturing defects for one full year from purchase date.

*Heat control is important. Our clear differential covers are designed to withstand upwards of 300° but exhaust pipes should be kept a minimum 6" away or have heat shielding to keep radiant heat from potentially damaging the polycarbonate. Not recommended for heavy towing.

Legacy Form USA is not responsible for damage from outside radiant heat sources.

Typically ships within 7-10 days.

Ghost Cover FAQ

A: We currently offer Ghost Covers for Duramax, LS, and SBC engine platforms. As well as AAM 11.5/11.8 differentials. Cummins and other applications are in development.

A: Yes — they’re thermoformed from optical-grade, heat-resistant polycarbonate. Each one is coated with a ceramic barrier for added oil repellency and durability.

A: No noticeable yellowing has occurred in testing. Covers are made from UV-stabilized polycarbonate and ceramic-coated for additional protection. Long-term exposure testing is ongoing, but results so far are excellent.

A: They’re made to run. Durability has been tested under heat, vibration, oil exposure, and real-world driving conditions. They’re not indestructible, but they’re absolutely built for real engines, not just display.

A: Installation is straightforward — apply the provided clear RTV sealant, allow it to partially cure (per instructions), then lightly snug the included hardware. We provide 29 bolts for a 28-bolt install… just in case the engine bay eats one.

A: Each cover is handcrafted, and minor imperfections may occur — particularly in areas like the flange or edge. These do not affect performance or clarity when installed. We inspect every cover and only ship what we believe you’ll be proud to run. Expect show-stopping engine bay visibility, not lab-grade perfection under LED magnifiers.

A: Crazing is a fine, hairline cracking that can appear in the polycarbonate during or shortly after ceramic coating. It typically shows up in high-stress flange areas caused by the thermoforming process.
It doesn’t affect strength or clarity in the visible zone and is mostly cosmetic. We actively work to minimize it, but it’s considered a normal characteristic of coated thermoformed polycarbonate.

A: We don’t currently offer a DIY ceramic kit, and flame polishing is not recommended post-forming. All covers ship pre-coated and flame-finished at the factory. Reach out if you’re chasing something custom — we’re happy to talk shop.

A: No — stick to mild soap and water only. Solvent-based cleaners like isopropyl alcohol, Windex, or ammonia can degrade the ceramic coating over time or cause hazing. Use a soft microfiber towel and wipe gently.