GPM Racing 4140 Steel Front/Rear Diff Outdrive for Losi Team Losi 1/8 LMT 4WD Solid Axle Monster Truck (LMT039S)
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
-
★★★★★
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
- 1/8
- Weight
- 24 g
About this product
Replacement Front/Rear Outdrive for LOSI LMT
This RC-scale replacement outdrive is intended for LOSI LMT solid axle monster trucks and is manufactured in 4140 steel to increase durability where the outdrive contacts the differential internals. It operates as the front and rear outdrive to help restore or extend drivetrain life for 1/8 and 1/10 LMT solid axle models.
The item is designed to replace the factory LOS242038 in compatible setups. Installation requires differential housing removal, installation of the new outdrive, and verification of pin seating and gear mesh alignment before finishing the assembly. Inspect gear face contact and pin seating to avoid premature wear.
When used for tuning or routine upkeep, a hardened 4140 steel outdrive reduces deformation under heavy loads and helps retain consistent gear engagement during demanding use, making it a sensible choice for enthusiasts focused on drivetrain reliability.
Compatible Model Numbers
- LOSI 1/8 LMT 4WD Solid Axle Monster Truck-LOS04022
- LOSI 1/8 LMT 4WD Solid Axle Monster Truck-LOS04021
- LOSI 1/8 LMT 4WD Solid Axle Mega Truck Brushless-LOS04024
- LOSI 1/10 TLR Tuned LMT 4WD Solid Axle Monster Truck KIT-LOS04027
- LOSI 1/8 LMT 2.0 Grave Digger 4X4 Solid Axle Brushless Monster Truck-LOS04028
Can this outdrive be used as a one-for-one replacement?
It is intended to match factory geometry in compatible applications and may replace LOS242038 where dimensions permit; always confirm fit and clearances before final installation.
What benefit does the 4140 material provide?
4140 material increases hardness and resistance to wear at contact surfaces, helping the outdrive maintain shape and gear engagement under load.
Any recommended inspection steps after fitting?
After installation, rotate the differential to confirm smooth function, recheck gear mesh and pin seating, and monitor for any unusual noise during the first runs. 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
