[My92Stealth]

I swapped a 25 spline transmission and transfer case into my 91 TT, which had with 18 spline to begin with, and I am having some troubles.

When I drive straight forward or back, everything is fine. But when I turn any amount in any direction, the car stutters and binds. It feels like something is binding up.
I dropped the transmission and the front diff. is in great shape. No missing teeth, no chunks taken out, spins fine, etc.
Prior to this I thought it may be a bad axle (the boot on the pass. side was torn and the car had been sitting for a few months) so I replaced it, but that did not solve the problem. I checked the drivers side axle and mid-shaft and both spin freely and seem to be fine.

Any ideas what might be wrong? Cars been down for about 6 months :\