TRAXXAS TRX4 Rear Knuckle Inner Case Upgrade 6061 T6 Aluminum TRX4022B by GPM  [TRX4022B]

TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B
Price:
CAD$26.85
Brand:
GPM
Model:
TRX4022B
GTIN:
4894538285383
Condition:
Brand New
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alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"
alt="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B" title="TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Arms Inner Case - 6pc set - GPM TRX4022B"

Aluminum inner case set for TRX4 rear knuckles

This 6-piece rear knuckle inner case set is engineered for the TRAXXAS TRX4 Trail Crawler platform to improve drivetrain stability under technical crawling. Machined from 6061 T6 aluminum with CNC precision, the cases form a stiffer housing that helps keep the inner gear stack aligned inside the rear knuckle arms during low-speed manoeuvres.

In practice, the inner cases reduce lateral movement in the rear knuckle gear stack so the gearbox meshes run steadier while the suspension articulates over rough trail features. That reduced slop helps keep tooth engagement consistent during challenging crawling lines on TRX4 chassis.

Hardware supplied: stainless steel cap head screw 2.5x8 - 4pcs for securing internal components. The full set contains six aluminum knuckle inner cases to service both rear knuckle assemblies.

Specifications

  • Item: Rear knuckle inner case set
  • Material: 6061 T6 aluminum
  • Model Number: TRX4022B
  • Compatibility: TRAXXAS TRX4 Trail Crawler
  • Quantity: 6 pcs
  • Included Hardware: Stainless steel cap head screw 2.5x8 - 4pcs
  • Manufacturing: CNC machined

Fit these aluminum inner cases where extra rigidity and precise gear alignment are needed for rock crawling and technical trail driving on TRX4 models; they are a chassis-level tune to cut drivetrain play without changing gear ratios.

This item is compatible with

  • TRAXXAS TRX4 Defender Trail Crawler

 

Product Reviews
1 Reviews
rating
The quality is good and both the delivery and the reception of the order, fast. I can not give more stars, because the price of each component is high, the cost of shipping very high, discounts for good customer null, and generic discounts, to use only

Will these fit TRX4 scale upgrades and alloy knuckles?

They are sized for standard TRAXXAS TRX4 Trail Crawler rear knuckles; check dimensions of any aftermarket knuckles before fitting to confirm clearance.

Do I need threadlocker on the screws?

A medium-strength threadlocker is recommended if you want to prevent screw backing during heavy trail use, but hand-tightening to specified torque is usually adequate.

Will these change gear ratios or backlash?

These inner cases stabilise gear alignment and reduce lateral play; they do not alter gear ratios but can lessen perceived backlash by keeping meshes steadier.

What tools should I use for installation?

Use standard RC hand tools and the correct 2.5mm hex driver for the supplied screws, and follow safe disassembly steps for the knuckle assembly.

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