GPM Racing Steel Adjustable Main Shaft with Alloy Body - 14pcs Set for Traxxas 1/10 TRX4 (TRX4037SAN)
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Handled by us in the UK under the Consumer Rights Act — no sending it overseas.
What our customers say
A selection of recent five-star reviews, as written.
-
★★★★★
Ordered flishrc cobra. Communication was great. Ordered larger batteries but they were the wrong size. Olly shipped the right batteries and gave a refund for the difference I paid. Couldn't ask for more. Thanks for the help with the order.
Robert, 22 September 2026
-
★★★★★
Very helpful when the vehicle I wanted wasn't in stock. Very fast deliver too.
Anna Abbott, 17 September 2026
-
★★★★★
Excellent service speedy delivery and good customer service
GLYN, 10 September 2026
-
★★★★★
Great product and service. I enjoy buying from these guys. Thanks to radio-controllled.co.uk.
Paul Jordan, 3 September 2026
-
★★★★★
Dealt with customer services over an order I accidently placed, they were prompt and dealt with it will, completely refunded within a small window of time, thanks!
Oliver Galustian, 23 July 2026
-
★★★★★
Really good online rc store with some great products and sales on. The owner is very knowledgeable as well.
Simon, 19 July 2026
-
★★★★★
Product delivered promptly and in excellent condition 👍had very helpful and prompt responses from Olly to all my questions, I will definitely be using them again 👍
Mark Clucas, 30 January 2026
-
★★★★★
The customer service and advice were first class!
Steve Avery, 9 September 2025
-
★★★★★
The seller knew I was after one and very kindly informed me when they came back into stock so now have a Flywing Bell 206. Fantastic bit of kit. Well worth the wait.
Pete Goddard, 15 April 2025
-
★★★★★
Great service, car arrived fast and really well packaged. Also, I had a little problem....(which turned out to be me doing it wrong) but someone replied the same evening! Will definitely be buying from them again.
Graham Rousseau, 10 February 2025
Key Specs
- Scale
- 1/10
- Weight
- 105 g
About this product
Engineering overview for TRX4 adjustable shaft
The TRX4037SAN kit is an aftermarket upgrade for TRAXXAS TRX4 Trail Crawler platforms, supplying a steel adjustable main shaft with an alloy outer sleeve and the included silicone o-rings and M4 screw shafts. The universal swing-shaft cross head allows increased steering and crawling angles, while the pinned head reduces the risk of component runout or loosening during sustained articulation.
Measured shaft lengths include front and rear adjustable ranges so installers can precisely tune wheelbase and axle offset for optimal clearance and roll characteristics. Silicone o-rings provide a compliant interface to minimize direct metal contact and reduce abrasive wear at high articulation angles.
Packing includes
- 4×1 White Silicone O-Ring – 4pcs
- 4×2.5 White Silicone O-Ring – 4pcs
- M4x2.5×11 Screw Shaft – 4pcs
Specifications
- Item: Steel Adjustable Main Shaft with Alloy Body, 14pcs set
- Material: Steel main shaft, alloy outer body, silicone o-rings
- Model Number: TRX4037SAN
- Compatibility: TRAXXAS TRX4 Trail Crawler
Recommended for builders who need to refine axle placement and steering geometry on TRX4 crawlers while maintaining durable mechanical contact interfaces.
How does the pinned head improve reliability?
The pinned head secures the cross head to the shaft, reducing relative motion at the joint and lowering the chance of fastener backing out under cyclic articulation.
What maintenance is recommended for longevity?
Periodic inspection of the silicone o-rings, verification of pin seating, and ensuring screw torque are maintained will preserve function and reduce wear.
Can I tune axle offset without replacing axles?
Yes. The adjustable ranges for front and rear allow axle offset and wheelbase tuning without changing axle housings, enabling chassis clearance and handling adjustments.
Is the supplied hardware adequate for race or trial use?
The included M4 screw shafts and o-rings are specified for correct fit; verify fastener torque and inspect components regularly under heavy use conditions. Write Product Review Please sign in your account before you can write any review.
Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.
What our customers say
A selection of recent five-star reviews, as written.
-
★★★★★
Ordered flishrc cobra. Communication was great. Ordered larger batteries but they were the wrong size. Olly shipped the right batteries and gave a refund for the difference I paid. Couldn't ask for more. Thanks for the help with the order.
Robert, 22 September 2026
-
★★★★★
Very helpful when the vehicle I wanted wasn't in stock. Very fast deliver too.
Anna Abbott, 17 September 2026
-
★★★★★
Excellent service speedy delivery and good customer service
GLYN, 10 September 2026
-
★★★★★
Great product and service. I enjoy buying from these guys. Thanks to radio-controllled.co.uk.
Paul Jordan, 3 September 2026
-
★★★★★
Dealt with customer services over an order I accidently placed, they were prompt and dealt with it will, completely refunded within a small window of time, thanks!
Oliver Galustian, 23 July 2026
-
★★★★★
Really good online rc store with some great products and sales on. The owner is very knowledgeable as well.
Simon, 19 July 2026
-
★★★★★
Product delivered promptly and in excellent condition 👍had very helpful and prompt responses from Olly to all my questions, I will definitely be using them again 👍
Mark Clucas, 30 January 2026
-
★★★★★
The customer service and advice were first class!
Steve Avery, 9 September 2025
-
★★★★★
The seller knew I was after one and very kindly informed me when they came back into stock so now have a Flywing Bell 206. Fantastic bit of kit. Well worth the wait.
Pete Goddard, 15 April 2025
-
★★★★★
Great service, car arrived fast and really well packaged. Also, I had a little problem....(which turned out to be me doing it wrong) but someone replied the same evening! Will definitely be buying from them again.
Graham Rousseau, 10 February 2025
