RC4WD Traxxas TRX-4 ARB Diff Cover (Black)

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RC4WD Traxxas TRX-4 ARB Diff Cover (Black)
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The RC4WD Traxxas TRX-4 ARB Diff Cover is an officially licensed CNC machined upgrade that will add scale detail and style to your TRX-4 build. 


  • CNC Machined
  • Billet Aluminum
  • Smooth Black Anodized Finish
Width: 1.38in / 35mm
Length: 1.50in / 38mm
Height: 0.73in / 18.5mm
Weight: 0.48oz / 13.5g

  • (1) RC4WD ARB Diff Cover for Traxxas TRX-4 (Black)
  • (1) M1.6 x 4mm Steel Socket Head Cap Screw (Z-S1232)
  • (1) ARB Decal Sheet

This product was added to our catalog on October 4, 2018

Kashi Jones
Verified Owner
Thursday, Nov 12 2020 (about 3 years ago)
RC4WD Traxxas TRX-4 ARB Diff Cover (Black)
Love this diff cover fits trx4 just fine. But WILL NOT FIT THE REAR OF TRX6 PROPERLY AT ALL FYI. Other than that i will stay with these. Can we get em in blue tho???
Scott Philipps
Verified Owner
Monday, Mar 9 2020 (about 3 years ago)
RC4WD Traxxas TRX-4 ARB Diff Cover (Black)
Great scale detail with the miniature drain plug bolt. Entire unit looks very cool on the truck and definitely adds to that scale look over a typical brass diff cover.

One large issue. The first one I got was machined perfectly, however the second unit had the wrong machining on the big bearing side of the rear spool. Required significant grinding and reshaping with a rotary tool to get the bearing to sit properly (was 2-3mm too small in radius). I verified this by swapping to both axles, with both spools, multiple times, even swapped bearings around from front to rear to verify. RC4WD needs to address this.
Verified Owner
Friday, Jan 21 2022 (about a year ago)
RC4WD Traxxas TRX-4 ARB Diff Cover (Black)
I have these on multiple trucks and they look great. No issues with fitment, very well made and love the scale look.