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1979 Trans Am Specs. Rate Topic: -----

#1 User is offline   MacDuff 

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  • Year: 1979
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  • Model: Trans Am
  • Engine: 403 6.6 Oldmobile
  • Transmission: Th-350 auto

Posted 20 November 2005 - 05:52 PM

Hey i was just wonderning what were the factory specs for a 79 trans am rear end, Turbohydramatic 200 3 speed auto transmission, and what rear end woud go with a muncie 4 speed manual transmission. Thanks...

This post has been edited by xX_The_Coolness_Xx: 20 November 2005 - 05:56 PM

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#2 User is offline   1tinindian 

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  • Engine: 403
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Posted 22 November 2005 - 03:33 PM

What specs are you looking for?
Gear ratios?
Ring size?

The trans would be a TH 350, not a 200.

And the rear gear ratio for the 4spd trans would depend on how you plan on using the car, ie, drag racing, highway cruising. Do you care about what kind of gas mileage you will get.

Give us more of an idea on how you will be using your car, and we can help further.

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#3 User is offline   MacDuff 

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  • Year: 1979
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  • Engine: 403 6.6 Oldmobile
  • Transmission: Th-350 auto

Posted 22 November 2005 - 09:56 PM

I mostly am looking for gear ratios and what combination tranny will go with what rear end for something that has lots of power but not too much modification for a really fast daily driver... So i need something that can handle power and last a while and take a beating... Thanks :beer:

This post has been edited by xX_The_Coolness_Xx: 22 November 2005 - 09:56 PM

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#4 User is offline   RamAirThree 

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Posted 23 November 2005 - 06:01 AM

Well a Muncie 4-speed close ratio transmission ( M21 and M22 Rockcrusher ) always came from the factory with a low geared (High numbered) rear end. ie: 3:73, 3:90 limited slip rear end.

Muncie 4-speed wide ratio transmissions ( M20 ) always came from the factory in high geared (lower numbered) rear end. ie: 3:08, 3:23, etc. limited slip rear.

But by your year, I believe Muncies were done and Pontiac were using Saginaw 4-speeds in Trans-Ams.

Can anybody confirm?

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#5 User is offline   Klickmania 

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Posted 23 November 2005 - 10:00 AM

Did they have the same rear end with the 3 speed automatics? Because that's what i think we've got. I"m not sure though.
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#6 User is offline   Crispy 

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Posted 25 November 2005 - 07:29 AM

Werent Muncies done in the mid or early 70's?
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#7 User is offline   nnolan 

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Posted 25 November 2005 - 08:16 AM

Yeah muncie's were gone after 74. Still looking for your factory specs on the 79 tho.
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#8 User is offline   nnolan 

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Posted 25 November 2005 - 08:45 AM

Ok, I did some searching and here's what I found: the 400 motors came with 3.23s and most of the 403 motors came with either 2.41s, 2.56s, or 2.73s. As far as what gears would be good for your 4-speed is up to you and how much you want to fork out for gas. If its a daily driver then you will really want to consider gas prices, if its a track only/weekend car then you might want to go with some that will have more low end accerleration. Either way I would ask around or even ride in some cars that have the gearing you are considering. Find out how they like it and how much difference you can feel with the gears. Just be informed, thats the best way to buy anything is to do the research yourself. Ultimately its your car and you will have to drive it not us. Good luck and let us know how it turns out.
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#9 User is offline   MacDuff 

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  • Year: 1979
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  • Engine: 403 6.6 Oldmobile
  • Transmission: Th-350 auto

Posted 27 November 2005 - 04:31 PM

I'll keep you updated...Thanks alot by the way! :waitasec:
Oh yeah me and my bro thought it would be better if we kept the automatic just for now so which rear end would be good with it? Thanks again...

This post has been edited by xX_The_Coolness_Xx: 27 November 2005 - 04:38 PM

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#10 User is offline   nnolan 

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Posted 28 November 2005 - 08:39 AM

Once again depends on what you want. Is it gonna be a street car? Do you care about gas mileage?
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#11 User is offline   Klickmania 

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Posted 28 November 2005 - 05:16 PM

It's definatly not going to be a drag/track car. Definatly a street car, but i don't know how often. Possibly a daily driver, but with gas prices it might not be. But the good thing is that they're starting to lower around here, so its might still be a possiblity. If anything it's going to be a weekend car. I would like a daily driver, that would be cool.
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#12 User is offline   fireduck350 

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Posted 28 November 2005 - 05:21 PM

The right gear ratio also needs to be matched to your cam specs. If you have a lot of duration and lift, then you will want a lower gear. But, with a 400 Poncho engine, you shouldn't need as low of a gear as you would need with a small block Chevy with similar cam specs. For daily driving, especially if you are going to go out on the highway, I would try to stick with somewhere around a 3.08 or 3.23. The 400 should make plenty of torque where a low gear ratio shouldn't be too necessary. If you want a lower gear ratio to get off the line better, then maybe go with 3.42 or 3.55, but I don't think I would go any further then that, especially without overdrive.
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#13 User is offline   nnolan 

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Posted 28 November 2005 - 05:41 PM

Good answer Fireduck, I had almost forgot it was a 79.
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#14 User is offline   Klickmania 

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Posted 28 November 2005 - 06:03 PM

What would be a good cam for a stock 403 Olds with an auto?
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