I am planning on doing the J-Mod this weekend however; from my research on the forums (very helpful) I have a hunch that something may have already been done.
From what I have read one of the main reasons for doing the JMOD to achieve firmer/quicker shifts. especially the 1-2 shift, which most say is alot firmer. I do not know how a stock unmodified T-Bird would handle the 1-2 shift, but mine seems to be pretty firm already under normal acceleration, and under heavy acceleration I can, most times, chirp the tire(s). The 2-3 shift seems to be fairly mellow and the TC lockup from thrid is pretty mellow.
Once I remove the VB, is there any way to identify if a shift kit has been added? I assume that I would be able to tell the JMOD by looking at the accumulators and the springs, but a shift kit I am not sure about. The stock trans pan is still present, although that doesn't rule out any modifications.
Just wondering if there are any indicators that something may have been done to the trans in it's past.