GPM Racing 40CR Steel Spiral-Cut 37-Tooth Ring and 13-Tooth Pinion Differential Gear Sets for Traxxas 1/10 Slash 4x4 Lcg (SLA1337RS)

Engineering notes for SLA1337RS

The SLA1337RS is a CNC-oriented 40CR steel spiral-cut ring and pinion offered as an aftermarket replacement for specified TRAXXAS 4WD rear gearboxes. Supplied as a 37-tooth ring and a 13-tooth pinion, the helix tooth geometry reduces impact loading on tooth flanks and supports smoother torque transfer through the driveline when the mesh is set correctly.

For best results, validate pinion seating, set backlash to the vehicle specification, inspect and replace bearings and seals as required, and apply the appropriate gear lubricant. Proper fastener torque and accurate mesh are essential to deliver consistent quiet running and reduce premature wear on steel-to-steel contact points.

Packing includes

• 37-Tooth ring – 1pcs
• 13-Tooth pinion – 1pcs

Original Name / Part No:

6879

Compatible Models

• TRAXXAS-1/10 SLASH 4X4
• TRAXXAS-1/7 4WD XO-01-64077
• TRAXXAS-1/10 4WD FORD GT 4-TEC 2.0 83056-4
• TRAXXAS-1/10 ELECTRIC RUSTLER 4X4 VXL-67076-4
• TRAXXAS-1/10 4WD HOSS 4X4 VXL 3S-90076-4
• TRAXXAS 1/10 4TEC 2.0 AWD CHASSIS WITH BRUSHED POWER SYSTEM 83024-4
• TRAXXAS 1/10 4TEC 2.0 AWD CHASSIS WITH VELINEON BRUSHLESS SYSTEM 83076-4
• TRAXXAS 1/10 CORVETTE AWD ON-ROAD CAR 93054-4
• TRAXXAS 1/10 Factory Five ’33 Hot Rod Coupe AWD ON-ROAD 93044-4
• TRAXXAS 1/10 Factory Five ’35 Hot Rod Truck AWD ON-ROAD 93034-4
• TRAXXAS 1/10 RAPTOR PRO 4WD OFF-ROAD TRUCK 101076-4
• TRAXXAS 1/10 Fiesta ST Rally FORD FIESTA AWD RALLY CAR 74054-4
• TRAXXAS 1/10 Mustang GT AWD ON-ROAD CAR 83044-4
• TRAXXAS 1/10 Slash 4X4 Ultimate BRUSHLESS PRO 4WD SHORT COURSE RACE TRUCK 68077-4
• TRAXXAS 1/10 Slash 4X4 VXL 4WD BRUSHLESS SHORT-COURSE TRUCK 68086-4
• TRAXXAS 1/10 Stampede 4X4 VXL 4WD BRUSHLESS MONSTER TRUCK 67086-4
• TRAXXAS 1/10 Toyota GR Supra GT4 AWD ON-ROAD CAR 93064-4
• TRAXXAS 1/10 Rustler 4X4 STADIUM TRUCK 67064-1
• TRAXXAS 1/10 Rustler 4X4 STADIUM TRUCK 67064-61
• TRAXXAS 1/10 Slash 4X4 SHORT COURSE TRUCK 68054-1
• TRAXXAS 1/10 Slash 4X4 SHORT COURSE TRUCK 68054-61
• TRAXXAS 1/10 Stampede 4X4 4WD MONSTER TRUCK 67054-61

Engineered as a robust 40CR steel spiral-cut replacement for the listed TRAXXAS gearboxes, SLA1337RS is intended for reliable torque transmission when installed with correct mesh, bearing condition, and lubrication.

What inspection points are critical before fitting?

Check pinion seating, bearing endplay, gear face contact pattern, and fastener torque; correct any bearing play and ensure the mating surfaces are clean.

Which lubricant is recommended for 40CR steel gears?

Use a high-quality gear grease suitable for steel gearsets; apply a thin, even film to the ring gear face and pinion to reduce friction and wear.

How does spiral-cut geometry affect load distribution?

The helix angle spreads contact over multiple teeth during engagement, lowering peak loads and improving smoothness compared with single-point impact on straight-cut teeth. 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.