GPM Racing 20CRMNTI Steel Center Diff Idler Gear 19T (M1.0) for Arrma 1/5 Kraton 8S (MAKX019TS)

Center Differential Idler Gear 19T (M1.0) Specifications

This replacement idler gear is an RC-scale center differential component manufactured for ARRMA 1/5 8S platforms, supplied as MAKX019TS. The gear is specified as 19 teeth, 1.0 module, and uses 20CrMnTi steel as noted in the source, intended to match the original center diff geometry and offer a direct replacement for the listed ARRMA models.

Use this part when servicing the center differential to restore correct gear engagement or to replace a worn factory unit. Before reassembly, inspect mating gears and the condition of bearings to ensure proper mesh and smooth rotation; correct alignment in the gearbox maintains drivetrain reliability and predictable performance under load.

Compatible Models

• ARRMA 1/5 Kraton 4X4 8S BLX Brushless Speed Monster Truck RTR-ARA110002
• ARRMA 1/5 Outcast 4WD 8S BLX Stunt Truck RTR-ARA5810
• ARRMA 1/5 Kraton 8S EXB 4X4 Roller Brushless Speed Truck-ARA5208
• ARRMA 1/5 Kraton 4X4 8S BLX EXB Brushless Monster Truck RTR-ARA5808V2
• ARRMA 1/5 Outcast 8S EXB 4X4 Roller Brushless Stunt Truck-ARA5210
• ARRMA 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR-ARA5810V2

How do I confirm fitment for my ARRMA gearbox?

Compare the tooth count (19T) and module (M1.0) to your original idler and confirm bearing dimensions; the part is intended to match the ARRMA 1/5 8S gear geometry listed in the compatibility section.

Are there any setup tips after installing this idler?

After installation, run the gearbox by hand to check for smooth engagement, inspect mesh under light load, and ensure bearings spin freely. Adjust shims or bearing seats as needed to achieve correct alignment.

What is the confirmed replacement part number?

The supplied reference indicates this idler replaces factory part number ARA310921; verify this against your vehicle before fitting. 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.