OK OK I know this gets beat to death. I have a slight driveline vibe only below 35 MPH maintaining speed. If I accelerate or let off and coast it goes away it is also not present at all above 35. Will just one inch of lift cause this (0-rate) or could it be driveshaft is pulled out of the slip yoke a bit too much?? I have whatever shims came with a 4" Superlift spring, and a zero rate. This only came about with the zero-rates and a tranny swap. U-joints are both brand new. Any advice what to change/check first?