The four-speed A518/46RH is essentially a three-speed 727 Torqueflite with an overdrive fourth gear in a slightly longer housing, the bellhousing pattern etc is the same so will bolt to what a small block727 did (a big block will need an adapter or the bellhousing cut off and replaced). With a “three-wire” lock-up A518, the operation of fourth gear and the lock-up can be controlled via oil pressure and vacuum switches.
Last edited by Philip; 22-09-21 at 09:15 AM.
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