4-speed chatter problem

440nika said

Yes the driveshaft is balanced. Does anyone have any idea how much of the pilot shaft needs cut when installing the 4-speed with a crank from an automatic trans. On the web site bigblockdart.com it stated to cut 5/8" off the pilot shaft. Maybe that's not enough??

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You're gonna hate me for this....

I don't have the exact measurement. 5/8" sounds about right. What I always did was to install the bell without the clutch or flywheel installed. Measure from the trans mounting face of the bell to the bottom of the converter register in the crank. Transfer the measurement to the trans from the mounting face of the transmission to the end of the pilot shaft. That should show you how much you need to cut. I would suggest leaving it a little long, you can always trim more off. Install the trans with out the clutch or flywheel installed and make sure the pilot shaft doesn't bind. If it all works, put it back together and drive.

Regardless of whether your driveshaft is new. Check your installed angles.
I doubt a balance problem will give you problems taking off, but a bad angle will.