[BCOWANWHEELS]

the 4 bt is a direct bolt in but you need a 400 th trans. a 350 th wont hold the torque of a 4bt. a 6 bt you have to fab engine mounts and go with a more h/d trans. as for the lame duramax yes they run good for a while but as you all know any engine with aluminum heads has problems with head gaskets. expansion rates are different and they start leaking then you run em low on coolant then crack heads & burn pistons. poor design for gm. you all know its made by isuzu dont ya for gm.