GPM Racing Hardened Steel #45 Rear Differential Ring Gear & Pinion Gear - 6pcs Set for Traxxas 1/7 Unlimited Desert Racer-85076-4 (UDR1200S)
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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
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★★★★★
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
- 1/7
- Weight
- 55 g
About this product
Technical notes for UDR rear differential
Engineered as a direct replacement for the TRAXXAS Unlimited Desert Racer rear differential case, this ring and pinion set is manufactured from hardened steel #45 to provide consistent wear resistance under gearbox load. The kit is presented as a 6pcs assembly intended for rear differential installation.
Parts are finished to reduce gear clearance and promote steady tooth engagement for predictable torque transfer in typical RC operation. The set contains the ring gear, pinion gear, and the flat head screws required to secure the components in the rear differential housing.
Installation guidance: verify and set gear mesh and axial play within the vehicle maker’s tolerances, inspect bearings and replace if necessary, and apply the recommended torque to the mounting screws. Proper setup ensures the hardened steel gears maintain consistent contact and service life without specifying unverified performance claims.
Specifications
- Item: Rear differential ring gear & pinion gear 6pcs set
- Material: Hardened steel #45
- Model Number: UDR1200S
- Compatibility: TRAXXAS UNLIMITED DESERT RACER rear gearbox
A precision-focused, direct-fit hardened steel ring and pinion replacement for the UDR rear differential case, supplied with mounting hardware for installation.
How should backlash be set?
Set backlash to the vehicle manufacturer’s recommended range and confirm smooth rotation under load before final assembly to avoid premature wear.
Are special tools required?
Standard diff assembly tools are sufficient; use accurate torque tools for the mounting screws and a feeler gauge or dial indicator to check mesh if available.
When should bearings be replaced?
Inspect bearings for play and roughness during installation; replace any bearings showing wear to preserve gear alignment and load distribution.
What maintenance is recommended?
Regularly check mesh, re-torque fasteners after initial running, and inspect for wear after heavy use to maintain reliable drivetrain operation. 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
