GPM Racing 4140 Steel Front/Rear Diff Outdrive for Losi Team Losi 1/8 LMT 4WD Solid Axle Monster Truck (LMT039S)

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. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM's factory, so please allow around 14 days for dispatch.