[U47]

Originally Posted by Gary C

I have a '63 Safari w/ 4 spd Super Hydro I had rebuilt, & I needed an engine so I ended up with a slimjim "flex plate" for a '64, if anyone wants it...........

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

[Gary C]

Ok then, Thank You, I’m just learning this stuff
Now I know who I can offer this to, only a Roto Hydromatic man! G

[Gary C]

Thanks man, attached (if I did it correctly) are photos of my trans before rebuild showing the 12 bolts, the new flex plate I found in Norwalk showing 6 bolts & 6 spaces, & the slim jim I cannot use

[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.