Quote:
Originally Posted by U47
Roto is the only auto I know that has a flywheel instead of a flex plate.
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Original Hydra-Matics (which Pontiac used into 1956) not only had a flywheel, but it doubled as the front of the torus cover.
This picture is from a GMC Master Parts book. GMCs of that era used Pontiac V8s and continued to use the Dual-Range HydraMatic into the early 60s.
Note the 30 bolt holes around the outer diameter of the flywheel and torus cover to hold the parts together.