RCFeed Logo
Builds FeedParts FeedRC MarketplaceDiscussAbout Us
Parts/Scale & lighting/Scale accessories/RC4WD ARB Differential Cover for Traxxas TRX-4 (Black)
RC4WD ARB Differential Cover for Traxxas TRX-4 (Black)
RC4WD

RC4WD ARB Differential Cover for Traxxas TRX-4 (Black)

Part # RC4ZS19034.3(3)
Scale accessoriesLandcraft
Fits
Traxxas TRX-4Traxxas TRX-6
Where to buy
$22.99
AMain Hobbies
Seen Oct 12, 2026
$22.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

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. 

Features:

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

Includes:
  • (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

Reviews4.3 · 3 reviews

Kashi JonesVerified owneron RC4WD ARB Differential Cover for Traxxas TRX-4 (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???

2 found this helpful
Scott PhilippsVerified owneron RC4WD ARB Differential Cover for Traxxas TRX-4 (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.

1 found this helpful
ScoDirt88Verified owneron RC4WD ARB Differential Cover for Traxxas TRX-4 (Black)

I have these on multiple trucks and they look great. No issues with fitment, very well made and love the scale look.

What reviewers say

Reviewers generally praise the cover's scale look, including the miniature drain plug bolt, and its fit on the TRX-4 (one reviewer uses several). One reviewer reports it does not fit the rear of a TRX-6, and one reports a machining defect: a second unit's rear spool bearing side was too small by 2-3mm, requiring grinding to fit. Ratings are 5, 3 and 5 out of 5. The sample is small, and the reviews concern the black variant.

  • + Scale look with miniature drain plug bolt
  • + Good fit on TRX-4
  • + Well made
  • − Does not fit TRX-6 rear
  • − Machining defect on one unit's rear spool bearing side
  • − Required grinding to fit the bearing
Summary generated from the reviews above.

Builds using this part

No builds use this part yet — add it to yours from the build editor.