Converter Slip............?
CP,
A Play-Back Tach would work WONDERS for what your Looking to Find out???
If You dont have 1?
I Have a Auto-Meter Pro/Comp Ultra Lite Playback Tach-6884 that I would be willing to send you and see if it would HELP you find the PROBLEM?
The Tach Was in My Chevy II,so its already SEEN Action!
Let me know?
Later
Greg 8)