Hydra-matic ???? what are they
Thread Starter
Launching!
Joined: Jul 2006
Posts: 244
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From: Bay Area ,CA
Hydra-matic ???? what are they so i was under my casr today replacing that goddamn shitty tranny mount and i look up and see this green plate and it says hydra-matic. I thought i had a TH400 or something did not know but is the company that makes the 4l60e, because that what iam running i think, don;t know much about trannys, well hear is the serial number it had 7ff 07. i have no clue what i have.
Hydramatic is GMs Automatic transmission division TH350=TURBO HYDRAMATIC 350,
H400= HYDRAMATIC 400 ,TH700R4 = TURBO HYDRAMATIC 700R4 etc.
Its not important dosent mean anything really.
Im not sure what year you have but unless its been changed and its auto car from 94-present its a 4l60e or 4l65e
H400= HYDRAMATIC 400 ,TH700R4 = TURBO HYDRAMATIC 700R4 etc.
Its not important dosent mean anything really.
Im not sure what year you have but unless its been changed and its auto car from 94-present its a 4l60e or 4l65e
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Thread Starter
Launching!
Joined: Jul 2006
Posts: 244
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From: Bay Area ,CA
Well there is a little green plate and it says Hydra-matic on it with a serial number on it. Its a 1997 Trans Am, looks clean under there and there is a "H" sign on the side with little marks on the sides. Don't know the previous owner looked like he knew what he was doing. id have to look over the old recipes to make sure what other things it has done with it.
a TH400 is a 3 speed auto and a 4l60e is a 4-speed auto(has overdrive) you should easily be able to tell which one you have.....as said above hydramatic was GM's automatic transmission division...i don't believe they currently are called that but i could be wrong there
Teching In
Joined: May 2007
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GM Powertrain is now a single entity (engines and transmissions combined). Hydramatic as a brand name for automatic transmissions (rather than the division name) is still in use, but has been de-emphasized for quite some time now.
Originally Posted by losaltos6
Well there is a little green plate and it says Hydra-matic on it with a serial number on it. Its a 1997 Trans Am, looks clean under there and there is a "H" sign on the side with little marks on the sides. Don't know the previous owner looked like he knew what he was doing. id have to look over the old recipes to make sure what other things it has done with it.
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TECH Enthusiast
Joined: Jul 2006
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From: San Diego
Originally Posted by Vince @ FLT
The little green plate that you see is the sign that the transmission has been replaced in your car. That is a GM certa tag that was put on the transmission when it was rebuilt at one of their re-man facilities. The trans was probably replaced under warranty. Vince
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I only know that my past 1972 with a big iron bock 455 motor had a turbo hydramatic transmission and I never had any problems with it ... drove the living **** out of it. It was a good tranny.
