TRAXXAS TRX4 Brass outer portal housings heavy edition - TRX4021X by GPM  [TRX4021X]

TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X
Price:
CAD$55.50
Brand:
GPM
Model:
TRX4021X
GTIN:
4894538283372
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alt="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X" title="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X"
alt="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X" title="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X"
alt="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X" title="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X"
alt="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X" title="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X"
alt="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X" title="TRAXXAS TRX4 TRAIL CRAWLER Brass Outer Portal Drive Housing (Front Or Rear)'heavy Edition'-18pc set - GPM TRX4021X"

Weighted brass portal housings for TRX4 use

This heavy edition brass outer portal drive housing is an upgrade made for the TRAXXAS TRX4 platform. Machined from brass to increase rotating mass, each housing adds about 50 grams per wheel to improve wheel contact and control at low crawl speeds and to assist over shallow obstacles.

Units suit either front or rear portals and are supplied as a matched set to preserve axle balance. The extra mass helps wheels keep bite when tyres sink into ruts or softer ground, letting the model recover traction and settle back to neutral more predictably.

Mounting hardware is supplied, including stainless steel flat head screws sized 2.5x8, 16 pcs. The parts are intended as a bolt-on replacement for stock outer portal housings with no core driveline modification assumed; install using standard TRX4 portal removal and reassembly steps.

Specifications

  • Item: Brass outer portal drive housing (heavy edition)
  • Material: Brass
  • Model Number: TRX4021X
  • Compatibility: TRAXXAS TRX4
  • Quantity Included: 18 pcs set
  • Included Hardware: Stainless Steel Flat Head Screw 2.5x8 - 16 pcs
  • Weight Effect: Adds ~50 g per wheel
  • Position: Front or rear portal housings

For TRX4 owners looking for a simple rotating mass upgrade to boost low-speed crawl stability, these brass outer portal housings provide a direct-fit replacement that improves ground engagement without altering core driveline components.

This item is compatible with

  • TRAXXAS TRX4 Defender Trail Crawler

Will these fit every TRX4 axle variant?

They are designed for TRAXXAS TRX4 portal housings; check your axle casting and portal bolt pattern to confirm compatibility before ordering.

How much additional rotating weight is added?

Each brass housing increases rotating mass by approximately 50 grams at the wheel, which helps momentum during slow crawling.

Does the set include all necessary screws?

Yes. The package includes 16 stainless steel flat head screws, size 2.5x8, for mounting the housings.

Will adding this weight strain my drivetrain?

These are scale accessories that increase wheel mass; monitor motor and ESC temperatures during extended runs and ensure your driveline is in good condition for heavier rotating loads.

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