I get a bad vibration coming up through the sifter at 2800 RPM thru 3000 RPM. There is no vibration before or after. 383 stroker externally balanced with correct flywheel, 4 speed T10. Any suggestions would be appreciated.
Does it do it if you are sitting in nuetral? How about with the clutched pressed? If it only does it while driving, I would suspect your driveshaft may be out of balance. If it does it while sitting still in nuetral, you might want to double check your dampner and flywheel, to make sure they are tight.
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