1963 Pontiac Catalina Boston CL - The Supercar Registry

11-24-2025, 09:45 PM

Keith Seymore Keith Seymore is offline

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Quote:

Originally Posted by olredalert

----What 3 speed automatic trans would a 63 Pontiac have?

Quote:

Originally Posted by Ralph Spears

Roto- Hydramatic transmission

Also known as the "Slim Jim" trans.

It uses a flex plate rather than a torque converter, coupled with a "super low" first gear, then regular first, second and third.

I pulled mine out and replaced with a TH400 from a '67 Buick Riviera.

K

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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.56 @ 139 mph best

Last edited by Keith Seymore; 11-24-2025 at 09:48 PM.

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