This is a Traxxas 37-Tooth Ring and 13-Tooth Pinion Gear Set for the Traxxas T-Maxx .15, 2.5, 2.5R, 3.3 (model 4909 only), and E-Maxx (model 3906 only).  The differential carrier is also included.

FEATURES:
Replaces worn differential gears
Ring gear, pinion, washer and screws are constructed of steel
Differential carrier is made of plastic

INCLUDES:
One 37 tooth ring gear
One 13 tooth pinion gear
One differential carrier
One 6x10x0.5mm teflon washer
Four machine screws

Fits Traxxas T-Maxx .15, 2.5, 2.5R, 3.3 (model 4909 only - does not fit 2008 model 4908), and E-Maxx (model 3906 only - does not fit model 3905)