i am helping my brother work on his truck and i was wondering where to find the vehicle speed sensor. the truck is a 99 24v, nv4500, 2500, 4x4,standard cab, i thought it would be on the tailshaft of the transfercase but it is not.

 

if its in the same spot as my 01 there was one up by where the transmission and transfer case come together but i also think there is one on the back axle some where

 

On truck with a 5 speed transmission, the speed sensor is mounted to the top of the rear diff. If he has 4 wheel ABS there are 2 others, one on each front wheel.