M21 transmition 660 case vs 661 - The Supercar Registry

12-18-2004, 05:39 PM

P.J.

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M21 transmition 660 case vs 661

My gm book says that all 1970 chevelles that had m21 tranies installed were 661 cases, 584 tail housing,648 side covers. Could early built 70 chevelles Kansas built cars have m21 660 cases?
Peter

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