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Old 11-25-2002, 06:48 PM
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Post TH350 swap questions

I've finally figured out which rear-end I'll use on my 79 Trans Am: 3.23 posi. I've got that all purchased, but i want to swap out my current transmission, which is the TH250 3spd Auto.

How would I go about swapping an Auto transmission with a 4spd TH350??? I want to get this done, because of numerous leaks I've discovered, as well as the desire to go standard...Thanks guys..

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Old 11-25-2002, 07:08 PM
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[QUOTE]Originally posted by WS6tech:
How would I go about swapping an Auto transmission with a 4spd TH350?

Hate to tell you this BUT a Turbo 350 is NOT a 4 speed. 3 forwards.......

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Old 11-25-2002, 07:13 PM
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Also......

All 4 speed automatics made in the past 25 years or so for GM motors are Overdrive in 4th. With a 3.23 rear gear.....you will be in the 2.25 range. That's too high in my opinion for performance.

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Old 11-25-2002, 07:19 PM
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oops, sorry about the 4spd mess up. i forgot about that. 3.23 posi was used on stock T/A's all through the 70's, including 1979. On another note, its been recommended by Texas Trans Am....

About the TH350 swap, how is it done?? And how do you add the 3rd pedal??? lol, sorry for the newbie questions....
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Old 11-25-2002, 07:56 PM
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What 3rd pedal?

Turbo 350's are automatics........

<img src="confused.gif" border="0">

[ November 25, 2002: Message edited by: Deuce Roadster ]</p>
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Old 11-25-2002, 08:08 PM
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TH350 3spd??? what are u talking about...??
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Old 11-25-2002, 10:33 PM
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OK.
Powerglide...GM 2-speed automatic
TH350...GM 3-speed automatic (Turbohydramatic)
TH400...GM 3-speed automatic (bigger and tougher)
700R, 200R, etc...4-speed automatics where 4th is overdrive
There were, of course, Chevrolet,Cadillac, Buick, Olds, Pontiac variants of automatics from 1940-the 70s but the above are the most used in the "modern" era. In fact, most transmission shops will think anything that isn't OD or electronic is stone-age technology.
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Old 11-25-2002, 10:53 PM
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what manual transmissions can be used with this set-up??? Is it even possible??? I'm fairly sure 403's have bolted up with manuals before...Thanks for bearing with guys...
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Old 11-26-2002, 09:45 AM
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You can convert the car to a manual set-up if you like. You will need the pedal assembly for a stick car,trans itself, shifter, and all the linkage. Everything will bolt right on to your car with the exception of the hold in the floor for the shifter. I have a complete set up including trans and nice shifter for 500.00. You would need to purchase a different clutch housing, flywheel,and clutch set to fit the olds but that is it. My guess is you could find those items on e-bay for cheep. Let me know.

[ November 26, 2002: Message edited by: racer56 ]</p>
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Old 11-26-2002, 01:47 PM
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racer, I'm very interested. My email is robbyz2001@hotmail.com, or and me to your messanger list if you have it.....
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Old 11-26-2002, 03:49 PM
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I sent you an e-mail.
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Old 11-26-2002, 04:14 PM
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another way to do this swap is to use a Howe pedal and a hydraulic throwout bearing. That would eliminate having to put in the z-bar and all the other crap to make it work. just my two cents worth.
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Old 11-26-2002, 05:00 PM
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Racer, i didn't get the email in my inbox. was robbyz2001@hotmail.com used???
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Old 11-26-2002, 05:03 PM
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ryanandbrandy@joplin.com is mine. Send me an e-mail and I'll give you my number.
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