14 Bolt Differential Cover

Corporate 14 Bolt 3/8" Differential Cover

Heavy‑Duty Welded Armored Cover for GM & Chevy 3/4‑Ton & 1‑Ton Trucks

This 3/8″ thick diff cover is engineered to protect your Corporate 14 Bolt axle on GM trucks under serious trail and towing use. Made from high-strength A50 plate steel and fully welded inside and out, it delivers rugged durability where it counts.

The one-piece cap is bent eight ways and welded to a matching 3/8″ ring, then CNC-machined flat to ensure a perfect seal—no leaks, no fuss. Compatible with both full-float and ribbed 14 Bolt housings; not compatible with AAM axles.

Key Features:

• Part Number: R1266
• Material: 3/8″ thick A50 plate steel (50,000 PSI)
• Fitment: Corporate 14 Bolt axles (GM/Chevy 3/4 Ton and 1 Ton trucks)
• Design: One-piece cover bent 8 ways and welded to 3/8″ ring
• Surface: CNC-machined flat for leak-free sealing
• Installation: Bolt-on with or without optional bolt kit
• Bolt Options (sold separately): M8 x 1.25‑30 mm or 3/8″ x 1″ bolts with washers
• Made in the USA
• Backed by RuffStuff’s Lifetime Guarantee

This cover can be purchased with or without diff cover bolts. We offer two hardware kits depending on your axle’s bolt thread size:

• M8 x 1.25 – 30mm bolts with washers: Commonly used on newer GM axles with metric threads.
• 3/8" x 1" bolts with washers: Typically found on older 14 bolt axles with standard threads.

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Both bolt kits are high-strength, zinc-coated Grade 8 hardware, designed for maximum clamping force and corrosion resistance.