
Originally Posted by
FordMan77
Could be the axles. How long have the springs been in? If it's been a while and everything was ok at install then I'd bet the suspension geometry is off due to the springs and you need a spacer to bring the driveline back into spec, along with some new axles since they are now toast due to excess wear/angle.
The only other thing that comes to mind is engine and trans mounts. If they are shot then it could screw up the drivetrain since everything would be sitting lower.