Poor Man’s Jerico
The Toploader we scored, a wide-ratio four-speed with a 2.78:1 First gear originally out of a ’68 390 GT Mustang, had already been Pro Shifted by a previous owner, who used it in an early Mustang. Along the way its 11/16-inch input shaft had been swapped out for a beefier aftermarket 13/8-inch input as used on factory 427 and 428 big-blocks. The Pro Shifting process involves milling or grinding the face teeth off the factory gears and replacing them with the Pro Shift rings (arrow), which are welded by a special process to the gear. Unfortunately, the big input shaft’s larger throwout bearing won’t work with a Fox Mustang’s cable-operated linkage setup, and swapping to a hydraulic throwout would be grossly complicated and expensive. An easier solution was to get a used small input shaft from David Kee Toploaders and send it off to Liberty’s to be Pro Shifted. View Related Article
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