[Bill Hanlon]

Originally Posted by U47

Roto is the only auto I know that has a flywheel instead of a flex plate.

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.

[U47]

Originally Posted by Bill Hanlon

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.

Yeah, they called it a flywheel , but it's nothing like Roto's thick and heavy one.

[pfilean]

Just to continue the discussion - or start an argument. The 1961 Hydra-matic manual shows for the Roto a flywheel and for the 315 HM BOTH a flywheel and a flex plate. Although, as pointed out, it looks like the flywheel is also the front torus cover.. And I know the caption for the Roto says 3 speed but lets not start that argument again.