HPI Savage 21 Delrin 39T 2-speed second gear DSAV1639T2T by GPM  [DSAV1639T2T]

Replacement 39T second gear for Savage 21

This Delrin replacement second gear fits the HPI Savage 21 platform and is identified as model DSAV1639T2T. The Delrin material lowers friction in the gearbox and helps provide a predictable shift feel for typical off-road bashing and trail runs.

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.

Fitting tips:

• Check existing gear mesh and clearance before final assembly to avoid binding.
• Inspect the mating spur and pinion for signs of wear and replace any degraded parts to protect the new gear.
• Start screws by hand and tighten progressively to ensure even seating without over-torquing.

Tuning notes:

• Use this Delrin second gear to keep shifting consistent when running stock or mildly modified drivetrains.
• Delrin reduces contact friction to smooth gear engagement but does not alter gear ratios; change tooth counts for ratio changes.