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Does anyone know the differences between a 1966 and 1989 flexpate, size, # of teeth, weight, balance?

Thanks
John
 

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youre asking a BROAD question......what tranny makes a difference

the balance on 81-later (i believe) 5.0's is 50 oz. where pre 80's is 25 oz..... ask me how I know!
 

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i think the `66 with a C4 uses a 157 tooth with 28 oz. imbalance
the later uses a 161 tooth with around a 50 oz.
 
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