Some times that happens on chassis dyno’s. Not sure why, change of driveline angles because its strapped down or some thing else. I know of a max wedge car that had it happen. Check the sprag.

Last edited by FurryStump; 05/23/19 09:22 AM.
best of 11.24 at 119 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]