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Old 05-16-16, 06:05PM   #1
Betty56
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Default 1960 389 in a 1956

Hello. We just put a1960 389 in a 56 chairman. The tranny is the original 56 single coupling hydramatic . it leaks I take that back it pours tranny fluid. Anyone have any suggestions
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Old 05-17-16, 04:29AM   #2
sprint250
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Shaft seals & the actual gasket for the two piece torus could be leaking. They were known for that.
Check all the simple stuff first.

a later model turbo-hydramatic 3 speed transmission can be mated to your engine using an adapter plate that can be had through WILCAP
http://www.wilcap.com/pontiac.html
Contact them for pricing and instructions.

If you absolutely have to ave an original 4 speed hydro there are parts rebuilding services for the old hydramatic 4 speeds.
Web search like dogpile will bring up a bunch of resources.

http://www.dogpile.com/search/web?fc...&ql=&qlnk=True

Here are a few results.


http://www.autotran.us/

http://www.fatsco.net/hydramatic.html

http://www.charlietranny.com/Hydramatic.htm

http://www.restorationhydramatics.com/

Unless you are married to the old 4spd Hydramatic for nostalgia reasons swap it out.

The later model dual coupling hydramatics were prone to shredding the fluid coupling if high power abuse was applied.
They were not as rugged as the earlier hydramatic trans that all the old gassers used.
GM ceased production by 65/66
They were gone from racing by the early 1970's
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Last edited by sprint250 : 05-17-16 at 04:46AM.
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Old 05-18-16, 07:12PM   #3
Betty56
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Thanks.had to take it out not sure if its even good now
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Old 05-18-16, 07:42PM   #4
Betty56
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I think the flywheel needs to be shaved any tips
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Old 05-18-16, 11:19PM   #5
sprint250
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Shaved?
Do you mean resurfaced?
Is there a problem between the mating surfaces of the flexplate , drive torus & crank flange?
If it is the standard " flywheel/ flexplate" for that engine & automatic trans it should not require that treatment.
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