the front drive shaft on an 02 doesnt spin because of the slide ring in the ft axel assembly. when u put it in 4wd, vacume advances a diaphram to move it onto a inner axel to connect it to the outter(passenger side). unless u have a locker I wouldnt waste ur time. have a buddy move ur truck while u watch it" no spin in 2wd" (DONT GET RAN OVER !):hehe: