DIY 13 Bolt DIFF Cover

Regular price $119.00 $107.10
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If you can weld and want to build your own diff cover, purchase the 13 Bolt DIY DIFF Cover. Motobilt DIY Diff Covers are the same as our fully-welded diff covers, but sold as a kit including the pre-formed pieces and hardware you will need to complete the DIY project yourself. We have included assembly instructions as well. 

Why change out your diff cover?  We do get asked this question on occasion.  The factory diff covers are too thin for abuse on the trail.  One of the common factory diff cover failures occurs when the edge gets peeled up from a rock sliding across the diff.  Peeling can cause the differential fluid to leak out unknowingly and the result could be damaging the gears when you hit the road to drive home. 

Another failure of factory diff covers are from bending the cover into the ring gear which rubs a hole through.  The result here is the same with differential fluid leaking out. One other failure is actually puncturing the factory diff cover with a sharp rock. Again resulting in differential fluid leaking out. Hopefully this explains the need for a heavy duty diff cover.  The Motobilt Heavy Duty Fabricated Diff Covers address the failures I have mentioned to ensure your ring and pinion gear sets are well protected.  

All Motobilt Diff Covers include a LIFETIME WARRANTY from trail damage and manufacture defect. We cannot warranty DIY Diff Covers being welded incorrectly. 

As with all Motobilt DIY builder parts, an experienced welder is recommended. 

Installation Note: We strongly recommend tacking the pieces together and test fitting it onto the axle before finish welding. We also recommend using pipe thread tape for the fill plug. 


  • 13 bolt diff cover
  • Standard 3/8 inch non ribbed housing bolts
  • Metric bolts for ribbed housings 
  • 1/4 inch thick steel plate shell
  • 3/8" thick steel diff ring
  • In-house laser and CNC press brake
  • Sold as kit
  • All parts are shipped bare metal and will need to be painted before install

DIY Diff Cover Kit includes:

  • Laser-cut 3/8" Ring
  • CNC-formed 1/4" thick shell
  • Oil fill weld-in bung and oil fill plug
  • Mounting hardware


  • 9/16 allen head - For the fill plug.
  • 12 point 3/8 socket or 8mm socket depending on ribbed or non ribbed housing and ratchet


Components/Assembly Instructions


Installation Instructions


  • Dispatch: Within 24 Hours
  • Free shipping across all products on a minimum purchase of $50.
  • International delivery time - 7-10 business days
  • Cash on delivery might be available
  • Easy 30 days returns and exchanges

If you do not like the product you can return it within 15 days - no questions asked. This excludes bodysuits, swimwear and clearance sale items. We have an easy and hassle free return policy. Please look at our Delivery & Returns section for further information.



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DIY 13 Bolt DIFF Cover

DIY 13 Bolt DIFF Cover

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