The TKO guyz should come soon...but I have never heard of this. They shouldent be very far off tho. Is he using the right crossmember and.or tranny mount.
Most people who do the TKO swap get vibration issues no matter what the crossmember/tranny mount configuration is. Its been found that most of the time the issue can be resolved by using adjustable upper control arms and getting the pinion angle correct so the vibrations go away.