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I have just installed a newly rebuilt 8 3/4 3:55 center chunk in my 71 dart . So far so good after the break in BUT I have noticed a howl at around 60-70 mph under load. below this nothing, slightly above nothing........any thoughts would be appreciated, it wasn't cheap. :banghead:

I'm putting a built 904 behind a 72 340 (CudaCox old motor). Does anyone have the pt. number for the weighted Flex plate I need? The convertor guy said its a better option then adding weights to the convertor.