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Small Block Ford Transmission Performance Input Shafts

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Larger, more common input shafts began in 1970 with a 26/26-spline shaft. From 1971, Ford went to a 24/26-spline split shaft of the same diameter. Hardened-steel shafts are available from the aftermarket.
C4 Transmission Performance Rebuild - Automatic Authority

 Larger, more common input shafts began in 1970 with a 26/26-spline shaft. From 1971, Ford went to a 24/26-spline split shaft of the same diameter. Hardened-steel shafts are available from the aftermarket.  View Related Article

 

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