Originally Posted by kendogg

1-2 and 2-3 upshifts are normally firm, sometimes a little hard, but firm, and I would even venture to say they are possibly late shifts as well, but I don't know these cars well enough yet to know what is normal. It seems right after the 2-3 upshift, something under the car clunks HARD, I can't tell yet if it is a suspension component clunking, or if it is the 3-4 upshift, but it really feel like it is happening during/because of a shift.

The downshifts are odd, it acts like it really doesn't want to downshift at all. It will, at the last possible second, but it acts like it doesn't like it, and yeah, I guess you could say the downshifts are harsh. Am I looking at vacuum modulator issues?