GPM Racing 4140 Carbon Steel + 7075 Alloy Rear Differential Gear Set 12/30T for Arrma 1/18 Granite Grom (MGG1230RS)
We are the importer of record — the price you see is the price you pay.
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
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★★★★★
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
- 1/18
- Weight
- 36 g
About this product
Precision Engineered Rear Differential for High Load Duty
The ARRMA GRANITE GROM MEGA Rear Differential Gear Set by GPM MGG1230RS is engineered with a focus on strength and service life. Key load-bearing parts are 4140 carbon alloy steel while housings and select components use 7075-T6 alloy; the design reflects precision engineering and CNC machined style tolerances for consistent meshing. The spiral cut ring gear aids controlled power transfer, and the large bevel gear (30T) and small bevel gear (12T) receive surface hardening to improve resistance to wear under heavy torque. Differential oil is not included; select and apply oil to tune slip and response based on running conditions.
Packing includes
- Rear Complete Differential – 1SET
- Rear Pinion Gear 12T – 1PCS
Original Name / Part No:
ARA311193+ARA311182
Compatible Models
- ARRMA 1/18 4WD GRANITE GROM MEGA 380 BRUSHED 4X4 MONSTER TRUCK-ARA2102
- ARRMA 1/14 TYPHON GROM MEGA 380 BRUSHED 4X4 SMALL SCALE BUGGY RTR-ARA2106
- ARRMA 1/16 MOJAVE GROM MEGA 380 BRUSHED 4X4 SMALL SCALE DESERT TRUCK RTR-ARA2104
- ARRMA 1/16 MOJAVE GROM 223S DSC 4X4 RTR BRUSHLESS DESERT TRUCK-ARA2304
- ARRMA 1/16 MOJAVE GROM 223S DSC 4X4 RTR BRUSHLESS DESERT TRUCK-ARA2304S
- ARRMA 1/14 TYPHON GROM 223S DSC 4X4 RTR BRUSHLESS BUGGY-ARA2306S
- ARRMA 1/14 TYPHON GROM 223S DSC 4X4 RTR BRUSHLESS BUGGY-ARA2306
- LOSI 1/12 NASCAR RC Racecar Ryan Blaney No. 12 2024 Menards Ford Mustang 2S AWD RTR Brushed On-Road-LOS1122412
- LOSI 1/12 NASCAR RC Racecar Chase Elliott No. 9 2024 NAPA Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122409
- LOSI 1/12 NASCAR RC Racecar Kyle Larson No. 5 2024 HendrickCars.com Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122405
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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
