GPM Racing 20CRMNTI Steel Spur Gear 43T (M1.0) for Arrma 1/5 Kraton 8S (MAKX043TS)

20CrMnTi Mod 1.0 43T spur for ARRMA 1/5

This 1/5-scale spur gear is an aftermarket replacement suitable for ARRMA Kraton and Outcast platforms, supplied as part number MAKX043TS. The component is manufactured from 20CrMnTi steel and features a Mod 1.0 profile with 43 teeth to match Mod 1.0 driveline geometry on ARRMA large-scale monster trucks. It is intended as a durable service item for the gearbox spur/pinion mesh system.

Fitment instructions: seat the spur onto the gearbox carrier following the chassis service manual, adjust spur and pinion backlash, confirm shim stack and bearing condition, and ensure free, unloaded rotation prior to the first run. Check pinion type and motor coupling clearance for the 43T diameter and replace any damaged fasteners when reassembling.

Functional notes: the hardened 20CrMnTi construction increases wear resistance under high torque, allows drivetrain ratio adjustments when used with different pinions, and provides a rugged replacement option for intensive off-road or stunt usage at 1/5 scale.

Packing includes

• Spur Gear 43T Mod 1.0 – 1pcs

Original Name / Part No:

ARA310920,ARA311051

Compatible Models

• ARRMA 1/5 Kraton 4X4 8S BLX Brushless Speed Monster Truck RTR-ARA110002 (Original Spur Gear 47T/M1.0)
• ARRMA 1/5 Outcast 4WD 8S BLX Stunt Truck RTR-ARA5810 (Original Spur Gear 47T/M1.0)
• ARRMA 1/5 Kraton 8S EXB 4X4 Roller Brushless Speed Truck-ARA5208 (Original Spur Gear 39T/M1.0 & 47T/M1.0)
• ARRMA 1/5 Kraton 4X4 8S BLX EXB Brushless Monster Truck RTR-ARA5808V2 (Original Spur Gear 47T/M1.0)
• ARRMA 1/5 Outcast 8S EXB 4X4 Roller Brushless Stunt Truck-ARA5210 (Original Spur Gear 39T/M1.0 & 47T/M1.0)
• ARRMA 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR-ARA5810V2 (Original Spur Gear 47T/M1.0)

Select this 20CrMnTi 43T spur when you need a hardened service replacement for 1/5-scale ARRMA drivetrains, and carry out standard spur and bearing checks during installation.

Does this replace the listed factory part numbers?

This item corresponds to applications where a 43T M1.0 spur is specified and replaces the original numbers ARA310920 and ARA311051 when dimensions match; always confirm physical fit prior to installation.

What checks should be performed after installation?

Verify backlash, torque mounting fasteners to spec, inspect bearings for play, and recheck settings after an initial low-load run to confirm stable mesh.

Is it compatible with existing Mod 1.0 pinions?

Compatibility is expected with Mod 1.0 pinions provided bore and diameter clearances are correct; adjust shims and re-evaluate mesh where necessary.

What advantages does 20CrMnTi offer?

The 20CrMnTi alloy improves surface hardness and resistance to wear compared with lower grade steels, increasing component life under sustained high torque. 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.