GPM Racing 4140 Medium Carbon Steel Front/Center/Rear Diff Outdrive for Arrma 1/7 Mojave EXB (MAJ039S)

Outdrive overview and fitment notes

This MAJ039S outdrive is an RC-scale replacement intended for ARRMA Mojave and related 1/7-1/8 EXB platforms. It interfaces between CVD or dogbone shafts and the differential, transferring torque while helping to retain the dogbone during heavy off-road loads.

Made in 4140 medium carbon steel and supplied as a pair, one flank of each outdrive is lengthened by 3mm to reduce the chance of dogbones slipping out under extreme suspension articulation and impacts. The geometry is produced to match ARRMA differential assemblies so it fits front, centre, or rear housings that accept the same interface.

Installation notes: check that the differential housing and CVD/dogbone interface match the original ARRMA components before fitting, use the supplied rubber washers where specified to get correct spacing and preload, and verify clearance during initial test runs. This component is a direct RC drivetrain replacement and is not intended for any full-scale vehicle use.

Packing includes

• Diff outdrive – 2pcs
• Rubber washer 4×2 – 4pcs
• Rubber washer 4×1.5 – 2pcs

Original Name / Part No:

ARA310981

Compatible Models

• ARRMA 1/7 Mojave 4WD Extreme Bash Roller Desert Truck(EXB)-ARA7204
• ARRMA 1/8 4WD RTR Outcast 6S BLX Stunt Truck Brushless
• ARRMA 1/8 4Wd Kraton Extreme Bash Roller Speed Monster Truck-ARA106053
• ARRMA 1/8 Talion 6S BLX 4WD Extreme Bash Speed Truggy RTR-ARA8707
• ARRMA 1/8 Kraton 6S BLX 4X4 Extreme Bash Speed Monster Truck-ARA8708T1
• ARRMA 1/7 Big Rock 6S 4X4 BLX Monster Truck RTR-ARA7612
• ARRMA 1/7 Limitless 8S AVC 4X4 Rtr Brushless Street Speed-ARA7816
• ARRMA 1/8 Notorious 6S V6 4X4 BLX Brushless Stunt Truck RTR-ARA8611V6
• ARRMA 1/8 Kraton 6S EXB 4X4 Rtr Brushless Speed Truck-ARA8708V6
• ARRMA 1/8 Kraton 6S 4X4 BLX Brushless Speed Monster Truck RTR-ARA8608V6
• ARRMA 1/7 Mojave 6S 4X4 RTR Brushless Desert Truck-ARA7604V3
• ARRMA 1/7 Mojave 6S EXB 4X4 RTR Brushless Desert Truck-ARA7704V3

Is this suitable for high-impact bashing?

The 4140 medium carbon steel construction provides increased durability for demanding use, though regular inspection after heavy impacts is advised.

Will I need to alter my dogbones?

No dogbone modification is typically required when the differential and CVD interfaces match. The 3mm extended flank aids retention without changes to standard dogbones.

What part number should I reference for ordering?

Order using the part number MAJ039S and check compatibility against ARA310981 as the original part reference. 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.