I could swear they had a ZF 4HP22 behind that diesel, not the EH like in the 745is but the standard shift one. Crap thing about the trans it's geared awful, a 2.47:1 first gear only.
If you toss in a five speed, the 265 Getrag is the stronger one from my memory. I agree with Tom, the T-bird or even a Mustang manual setup should be okay as that LSC is a Fox frame.