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To sum up if you have a vibration issue similar to mine first area to look is THE DAMPER. 360 engines are external balance and sensitive to being out of balance when damper gets old. Also try a different tranny mount. Rubber may cushion better than poly, maybe not if engine in good tune and balance.



Would be curious if you put on that new style poly prothane bushing whether it would add or not change any vibrations you have now.

I have heard that the poly trans mounts just magnify any vibration you have.

I know someone with a complete resto'd Challenger T/A that changed from poly to rubber and it helped a bunch. But after that, did a pinion angle correction and made a big difference.

The thing about the Summit brand balancer is a tough one to diagnose. I mean if it was new and didn't skip it marks, how could you check if it was bad?? Should we just avoid Summit brand dampners??

Hazwoy, did that Summit balancer show any sign of rubber gushing out or not looking uniform??