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SKU: R1266 14 Bolt 3/8" Differential Cover

14 Bolt 3/8" Differential Cover
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Purchase 14 Bolt 3/8" Differential Cover
  • 14 Bolt 3/8" Differential Cover

  • ★★★★★ ★★★★★ 19 reviews
  • Part Number: R1266
  • Shipping Weight: 21.00 pounds

  • $160.95

  • In Stock

Corporate 14 Bolt 3/8" Differential Cover 

This is our basic differential cover, we see it as the only one worth making. The Corporate 14 Bolt axle is found in Chevy 3/4 Ton Suburbans, 3/4 & 1 ton GM trucks, what they end up in is up to you. The differential cover is a 1 piece 3/8" (.375") plate steel cap bent 8 ways then welded to a 3/8" ring! One of the reasons it is so strong is that we manufacture it out of A50 plate steel, thats 50,000 PSI tensile strength. After welding, the mounting surface is machined absolutely flat for a perfect fit! It's a great addition to the already near bombproof 14 bolt axle.

Will fit full float 14 bolt axles and will mate up fine with your ribbed 14 bolt axle. However, the additional bolt kit that we sell WILL NOT work with the Ribbed style 14 bolt. You will need to reuse your factory bolts (if they are long enough) or purchase new metric bolts with thread pitch (M8 X 1.25).

  • Ring and Cover are 3/8" thick
  • Plate steel CNC bent 8 ways
  • Machined absolutely flat for a perfect fit
  • All seams welded inside and out
  • Optional bolt kit comes with (3/8) 12 point bolts with washers

(This will not fit the AAM rear axle, it is your responsibility to verify which axle you have and purchase accordingly) Here is the AAM cover GM / Dodge AAM 11.50 Differential Cover (

Write Review
★★★★★ ★★★★★
4.84/5 Stars out of 19 Reviews
Pages 1   2   3   4
Nice Cover
Zach (MA) | October 3rd, 2022
Excellent cover, very beefy and welds look great. Went to install it the night before a big wheeling trip and half of the holes didn’t line up with the threaded holes in the housing. So I drilled out all of the holes 1/16 bigger and I got it to fit. Overall, awesome cover just wish it bolted right up without having to modify it
Robert Alvarado (CA) | May 22nd, 2022
Great heavy duty, solid cover. Side holes were off by a tiny bit, didn't match correctly. Really hard to bolt to diff. But awesome cover.
Don't question, just buy it!
Bryan Johnson (TX) | March 21st, 2022
If you think you're on the fence about whether or not you need a cover this bomb proof, just buy it and never worry about what your diff could be hitting because it won't matter with this cover!
Unbeatable, but beatable!
Parker (MD) | January 23rd, 2022
Incredible covers. Nearly Indestructible. I will ALWAY buy ruff stuff diff covers over others. Buy one and be done (until you swap axles or build another rig... Only thing i would like to see is a fill hole. Factory is in the diff itself, but those plugs can be a pain. Thanks for another awesome product!
Outstanding Prodict
MARK W HILL (FL) | September 21st, 2021
3/8 steel isn't quite FMJ proof however its not gonna get a hole poked in it like a stock tin cover or those silly aluminum covers. GM Corp FF is my favorite rear end... This is the first cover that's worth of installing over stock.
  • RuffStuff Differential Covers

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⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to
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