HPI Savage 21 Delrin 39T Replacement 2-speed Second Gear DSAV1639T2T by GPM  [DSAV1639T2T]

39T second gear suitable for Savage 21

This 39-tooth Delrin second gear is a direct-fit replacement for HPI Savage 21 transmissions and is listed as DSAV1639T2T. The Delrin moulding reduces internal friction and aims to deliver consistent gear engagement in typical off-road and bash scenarios.

The item is supplied as a 1 pcs set and includes the mounting screws stated in the original product name. It is intended for direct replacement in compatible Savage 21 two-speed gear sets where the 39-tooth second gear is required.

Installation advice:

• Confirm gear mesh and clearances before completing assembly to avoid binding under load.
• Check the mating spur and pinion for wear and replace if needed to preserve the new gear.
• Hand-tighten fasteners initially, then torque in stages to ensure correct seating without over-tensioning.

Setup guidance:

• Fit this Delrin second gear to retain consistent shift characteristics with stock or lightly upgraded drivetrains.
• Delrin lowers contact friction to smooth transitions, but does not change gearbox ratios; fit different tooth counts for ratio alterations.