Old 09-20-2022, 10:16 AM
chiphead's Avatar
chiphead chiphead is offline
Ultimate Warrior
Join Date: Nov 2004
Location: Aiken, SC
Posts: 4,893
Default Early hydra matic basics?

Hey guys, I've come across a '57 Super Chief driver project. Supposedly original 347/auto car. I don't know anything about the early automatics. Can somebody give me the rundown on how they work, how good they are and what to look for? Thanks!

I could explain all this to the girl at the parts store, but she'd probably call the asylum.

'67 LeMans. 407/TH350/Ford 3.90.
13.0@102.5 N/A
11.82@110.1 50N/42F
Then it broke. Rebuild in process.
Old 09-20-2022, 08:00 PM
stevep's Avatar
stevep stevep is offline
Ultimate Warrior
Join Date: Dec 1999
Location: Mendon Mass
Posts: 6,500

I think that they are great transmission but I have rebuilding them for 40 years.
Inbox me any specifics

The difference between inlaws and outlaws? Outlaws are wanted
Old 09-21-2022, 01:00 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,019

I like early 4-speed HydraMatics. But- repairing them can be very expensive, and few transmission shops will service them.
'57 is a Dual-Coupling, which eliminates the harsh shifting of earlier Dual-Range HydraMatics. But it suffers from a performance standpoint; the 1-2 and 3-4 shifts can not be made quickly, since time is required to fill the front coupling with fluid.

Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
Old 09-21-2022, 06:35 AM
Safari Larry's Avatar
Safari Larry Safari Larry is offline
Senior Chief
Join Date: Mar 2008
Location: Lancaster, CA
Posts: 479

For the 1957 Hydramatic manual, go to www.pontiacsafari.com and select "Pontiac Garage". Scroll down to find the manual under "Pontiac Documents" heading.

For more general 57 Pontiac info, select "Pontiac Info" from the home page and scroll down to 1957.

Larry Gorden
POCI 1956 Tech Adviser

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