i got a 90 f150 that I got on trade its a 4x4 it been lifted and the original o/d trans was removed and a c6 was added when I got it it was missing a trans mount when I added one the driveshaft was to short I had one made and it fits but the driveshaft stil has a lot of pivot in it and it shakes and feels like somethings is binding up is there a drop crossmember or some how to lower the trans to take out some of th pivot.