Does it clunk when you put it in reverse or drive?Give it a little gas with foot on brake and shift from reverse to drive a few times if your getting a clunk between the shifts its u joint, also someone can look underneath and see if the driveshaft is "jumping" if so u joints,did you answer if your getting a pulse in your brake pedal when braking at higher speeds? Also could it be a out of balance or bent drive shaft?METALMOVER

1987 Raider,2.6,mt,78"Meyer snow plow,100lb. Doberman alarm,weber carb, lockouts from here- 1989 V-6,SWB, A.T. 4x4, 31'S