GPM Racing 4140 Medium Carbon Steel Front/Center/Rear Diff Outdrive for Arrma 1/8 Kraton 6S (MAK039SA)

Front/Center/Rear Differential Outdrive

This aftermarket outdrive is a direct-fit RC-scale replacement for ARRMA platforms, machined from 4140 medium carbon steel to resist wear in high-load drivetrain positions. It is intended for use in front, center, or rear differential housings where standard outdrives sit, and serves to keep CVD or dogbone shafts engaged while transmitting torque reliably.

One end of the outdrive is extended by 2mm to reduce the chance of dogbones slipping out during aggressive maneuvers, and the material choice balances toughness with dimensional stability to help maintain smoother rotation under load. The part is a focused upgrade for durability and drivetrain consistency rather than a tuning element to change gear ratios or handling.

Installation follows the vehicle’s stock differential procedure, using the same mounting locations and retaining hardware as the factory outdrive. Inspect mating CVDs, bearings, and retaining clips for wear during replacement to ensure correct fit and rotation.

Packing includes

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

Original Name / Part No:

AR310439

Compatible Models

• ARRMA 1/8 KRATON 6S AR106005/AR106015/AR106018
• ARRMA-1/8 4WD R/C TALION 6S BLX SPEED TRUGGY
• ARRMA 1/8 4WD RTR TYPHON 6S BLX BUGGY
• ARRMA-1/10 SENTON 6S BLX SHORT COURSE
• ARRMA 1/8 OUTCAST 6S BLX 4WD EXTREME BASH STUNT TRUCK-ARA8710
• ARRMA-1/8 TALION 6S BLX 4WD BRUSHLESS SPORT PERFORMANCE TRUGGY-ARA106048
• ARRMA 1/8 KRATON 6S BLX 4WD BRUSHLESS SPEED MONSTER TRUCK-ARA106040T1/T2
• ARRMA 1/8 NOTORIOUS 6S BLX 4WD BRUSHLESS CLASSIC STUNT TRUCK-ARA106044T1/T2
• ARRMA 1/8 OUTCAST 6S BLX 4WD BRUSHLESS STUNT TRUCK RTR-ARA106060
• ARRMA 1/8 4WD TYPHON 6S BLX BRUSHLESS BUGGY-ARA106046
• ARRMA 1/7 INFRACTION ALL-ROAD STREET BASH 6S BLX-ARA109001
• ARRMA 1/7 LIMITLESS ALL-ROAD SPEED BASH-ARA109011
• ARRMA 1/7 MOJAVE 6S BLX DESERT TRUCK-ARA106058T1/T2
• ARRMA 1/7 INFRACTION 6S BLX V2 ALL-ROAD TRUCK-ARA7615V2T1/T2
• ARRMA-1/7 4WD FIRETEAM TACTICAL UNIT 6S BLX SPEED ASSAULT VEHICLE-ARA7618
• ARRMA-1/8 4WD TYPHON TLR TUNED RACE READY ROLLER-ARA8306
• ARRMA 1/7 LIMITLESS V2 SPEED BASH ROLLER-ARA7116V2
• ARRMA 1/8 KRATON 6S V5 4WD BLX SPEED MONSTER TRUCK-ARA8608V5
• ARRMA-1/8 NOTORIOUS 6S V5 4WD BLX STUNT TRUCK-ARA8611V5
• ARRMA 1/7 MOJAVE 6S V2 4WD BLX DESERT TRUCK-ARA7604V2T1/T2
• ARRMA-1/8 TLR TUNED TYPHON 6S 4WD BLX BUGGY RTR-ARA8406
• ARRMA-1/8 TYPHON 6S-ARA406120
• ARRMA-1/8 TYPHON 6S V5 4X4 BLX BUGGY WITH SPEKTRUM FIRMA RTR-ARA8606V5
• ARRMA-1/7 FELONY 6S BLX STREET BASH ALL-ROAD MUSCLE CAR RTR-ARA7617V2T1/T2
• ARRMA-1/8 OUTCAST 6S BLX 4WD BRUSHLESS STUNT TRUCK-ARA106042

Is this a direct replacement for stock outdrives?

Yes, it fits the same differential locations and uses the factory retaining hardware for the listed ARRMA models.

Does the 2mm lengthened side require extra parts?

No extra parts are required, the extra length helps keep CVD or dogbone shafts engaged without additional hardware.

What maintenance should I do after fitting these outdrives?

Inspect mating CVDs and bearings, confirm washers and clips are seated, and run-in gently to check for smooth rotation. 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.