Hi Thanks for the input Guys.
All drive train, u js splined shaft rebuilt tires cant get balanced over here they are 33" and wont go on machine, have tried having someone follow and all checks out ok,Tried reving engine in neutral but nothing, Im sure I would notice one cylinder not firing! engine and truck is running sweet up till 60mph then vibration starts and 4x4 lever vibrates so you cant touch it lightly. Vibration is unreal and goes thru the steering wheel and the whole truck.
Iv always thought it could be in the transfer case but thats just a guess. If it is in the engine what else could it be?
Cheers all
John