i did a smf and new clutch swap to my f250 and now theres a loud rattle and vibration coming from tranny. its loud and is extremely annoying cant talk to someone while its doing this without yelling it vibrates hard enough my door mirriors vibrate like i got a couple 12s in it or something. it usually does it from 1700 to 2100 rpm. if i press the clutch in to coast its still vibrates but if i back of the clutch just before it catches it stops if i completely let out it starts again if theres no load on it it will do it pullin hills it wont if coastin down a hill withe clutch out itll do it. tightined all cross members and bolts n didnt help ne at all n u joints are good n is not coming from engine at all. i notice when takin of from stand still it pops and cracks a few times ne idea on what this could be because at 50 mph to 65mph i cant hear myself think its horrible