TeraFlex Suspension Differential Cover

TeraFlex HD Differential Covers: Trail-Tested Axle Protection

When the trail gets rough, your differential is one of the most vulnerable components underneath your Jeep. TeraFlex Suspension has engineered a lineup of heavy-duty differential covers specifically designed to address that vulnerability — replacing the thin, stamped-steel factory cover with a massively reinforced barrier built to take a direct hit from rocks, roots, and debris without compromising the gear oil inside.

Ductile-Iron Construction Sets the Standard

Differential covers in the TeraFlex HD lineup are cast from the same high-strength, 3/8"-thick ductile iron used in TeraFlex's own HD axle housings. That material choice is deliberate — ductile iron offers a superior combination of hardness and impact resistance compared to aluminum or stamped steel, meaning the cover can absorb glancing rock strikes without cracking or deforming. The result is a cover that genuinely matches the strength of the axle housing it protects.

Purpose-Built for Dana and AdvanTEK Axles

TeraFlex offers differential covers across a wide range of Jeep axle platforms, including the Dana 30 (Tera30 HD), Dana 44 (Tera44 and Tera44 Rubicon HD), Dana 60 (Tera CRD60), and newer AdvanTEK axles (M200, M210, and M220). Whether you're running a classic Wrangler YJ, TJ, or JK, or a newer JL or Gladiator JT, there's a fitment-specific cover engineered to drop right onto your housing.

Thoughtful Features for the Trail and the Garage

Beyond raw protection, TeraFlex adds practical details that serious wheelers will appreciate. The AdvanTEK-series covers feature a large-diameter fill tube and inspection port at the top, sized to accept a standard funnel or gear oil bottle pour spout for clean, easy fluid changes. A secondary fluid level port at mid-height doubles as an inspection port, letting you check fill level accurately without removing the cover. These are the kinds of features that make routine maintenance faster and less messy — especially important on a built rig that sees regular service intervals.

Kits also include polymer elastomer beaded gaskets that eliminate the need for messy RTV sealant and don't require any cure time before installation. The reusable gasket design means the cover can be removed and reinstalled cleanly, keeping the job tidy whether you're changing fluid on the trail or back in the garage.

A Natural Extension of the TeraFlex Axle Ecosystem

One of the most compelling reasons to choose TeraFlex differential covers is the integration with TeraFlex's proprietary axle housing lineup. Because the covers are cast from the same ductile iron spec as the Tera30, Tera44, and Tera CRD60 housings, they deliver a matched level of strength — there's no weak link introduced at the cover. For Jeep owners who have already invested in TeraFlex axle components, the HD differential cover is the natural finishing touch that keeps the entire drivetrain protection system consistent from housing to cover.

• 3/8"-thick ductile-iron casting matched to TeraFlex HD axle housing spec
• Wide axle compatibility: Dana 30, Dana 35, Dana 44, Dana 60, AdvanTEK M200/M210/M220
• Large-diameter fill tube and dual inspection ports on AdvanTEK-series covers
• Polymer elastomer beaded gaskets — no sealant, no cure time, reusable
• Bolt-on installation with fitment-specific kits for YJ, TJ, JK, JL, and JT platforms