HPI stock replacement Sprint RTR gear differential shaft. These are located on both sides of the differentials.
Features: Steel construction
INCLUDES: One left diff shaft One right diff shaft
Left shaft length: 36mm (1.42")
Right shaft length: 21mm (0.83")
you will replace this alot if you go with a 2 cell or 3 cell .dogbones will damage this and your car will go the the left or to the right