I have a 1991 Oldsmobile Cutlass Ciera(with 85k) when going from 3rd to 2nd it will make a "clunk" Not so much that it jerks the car around but you can feel it a little and hear it. It happens at 20mph every time. All other shifting is perfect or i think it's perfect as it took me couple times to even count how many speeds it had. quiet and soft. I guess it could be a little harder but seams good. transmission oil is red and seams good. I just got the car so i don't know when or how this started.
Searching the net only thing i could find with the same problems was
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he had the same problem with a 87 Calis but at 15mph it was broken servo spring. I was going to give it a looking at this weekend.
But i was hoping if anyone else had any ideas that i can look for?