Sounds like the flywheel might be the culprit, but it's more probable that the 403 is putting out too much power for the torque converter (2nd and 3rd gear scratch? WOW!).
Racers have used TH-350s for years behind BBO engines, but they certainly weren't stock.
Try realoldspower.com for further advise. Lotsa racer types there that could give you ideas and solutions.
Good luck!
C.J.
[ September 19, 2004: Message edited by: texasred ]</p>
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