This is the real deal! 32 spline for the BIG output Muncie 4 speed, ( oh, yeh, this is factory correct for the 400 automatic too). 1330 series u-joint for the 1970 - 79 Turbo 400 and the 1970 - 1974 Muncie BIG output. Top quality restoration grade as they are the same exact piece as O.E. If you like your 2 door Chevy and she needs a new slip, here's the correct thing to do!