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Old 12-24-2010, 06:33 PM
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82 firebird 383 stroker 4 or 5 speed

i recently bought an 82 firebird, and im planning to switch it over from automatic to standard, have access to a 5 sped out of an 80's camaro and a 4 speed out of a 70's camaro, have a 3.73 posi rear and not sure what to use, would like a good top speed and lots of bottom end torque, im totally new to cars, usually build trucks. can anyone make some recomendations?

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Old 12-24-2010, 06:41 PM
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If you plan to use the 80's 5-speed, it must be from a V8 Camaro/Firebird, a V6 or 4 cylinder trans will not live for long at all behind any V8, too weak and the gear ratios are all wrong for the power characteristics of a V8.
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Old 12-24-2010, 07:33 PM
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yeah it is out of a v8, its mated to a 350 right now, thanks eric

ive also got a 5 speed out of a 2wd chev truck, would that be any good for a firebird?
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Old 12-24-2010, 09:40 PM
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Quote:
Originally Posted by b00tz
yeah it is out of a v8, its mated to a 350 right now, thanks eric

ive also got a 5 speed out of a 2wd chev truck, would that be any good for a firebird?
I don't kow, I have no real experience with them. I know they aren't geared for performance use, have a real low 1st gear, and no seperate bellhousing the trans case and bell are one piece. Shifter location is not likely to match the car floor pan. Trans case my be physically too big to clear the stock floor.

You'll have to do some searching on the NV 3500 and NV4500 to see what they are all about.
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Old 12-25-2010, 08:56 PM
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just so you know, every 350 camaro and firebird from the 80s came out with an automatic because the 5 - speed could not handle the torque. even if you hop up a 305 the 5 - speed wont hold up. the 383 will be way worse. hands down you are better off with the 4 speed. you will probably have to get an adapter from someone though. as you may or may not know in 82 and later cars gm began to use a "floating" rear end connected to the tranny by a brace that was bolted to each. this brace must be mounted or the rear end must be made solid.
this is easy to do with a 350 turbo for instance but i have never messed with a standard.
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Old 12-25-2010, 09:22 PM
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Quote:
Originally Posted by 327TransAm
just so you know, every 350 camaro and firebird from the 80s came out with an automatic because the 5 - speed could not handle the torque. even if you hop up a 305 the 5 - speed wont hold up. the 383 will be way worse. hands down you are better off with the 4 speed. you will probably have to get an adapter from someone though. as you may or may not know in 82 and later cars gm began to use a "floating" rear end connected to the tranny by a brace that was bolted to each. this brace must be mounted or the rear end must be made solid.
this is easy to do with a 350 turbo for instance but i have never messed with a standard.
Yep, all true^^^. There are arm mount kits for TH-350's, but nothing for the Muncie unless you can find a kit that will add a crossmember/floor mount to attach the arm to instead of the transmission tailshaft housing.

This torque arm rear suspension, puny 7.5" rear end, and weak transmission is why GM's Camaro/Firebird lost it's 15+ year brand dominance at the dragstrip in the 80's and 90's-2000's to Ford's Mustang, which has a conventional 4-bar rear suspension and tough 8.8" rear axle in the V8 cars, helped by the fact the Stang weighed less and the 302 didn't make enough torque to break a T-5 trans. Ford never put a 351W in the Mustang for the same reason GM didn't use a 350 with the T-5 - the T-5 wouldn't handle that kind of torque without excessive warrantee losses.
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Old 12-26-2010, 08:06 PM
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there was a 9 bolt borg warner that came factory in selected higher performance models of the f-body's. it looks just like the 10 bolt but it has the borg warner emblem and is a lot stouter so i am told. my 85 trans am has one and it is a factory posi trac (limited slip) version with disk brakes. no parts are made for this trany unfortunately, not even gaskets. i have two of them counting the one in my TA and another that is fully chromed (not my doing).
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Old 12-27-2010, 10:45 AM
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BW 9bolt parts are sometimes available in australia.

WRT the 4speed, there was a T10 in the early 3rd gen cars, Ive never looked at this setup, but I imagine you could use pictures etc of it to fab up something for the muncie. Factory Muncies came with either a 2.20:1 ratio 1st gear (M21/M22 'close ratio') and the 2.52:1 1st of the M20 wide ratio. Either one is fine for your use, however you will need a rear axle ratio of 4.11 or so for the M21/M22 and 3.55/3.73:1 for the M20. Remember that these are direct drive in 4th gear...no overdrive. Overdrive isnt a good idea engineering wise. its loud, runs hot and is weaker, not to mention usually requiring a big case to get a big enough gear in there for high o/d values. The better performance solution is a 4spd, direct drive in high gear, with a low enough 1st gear to run a 3.23 or so rear axle. Good launch in 1st, and decent mileage in 4th...in a nice compact package.

For 3rd gen trans swaps and other info...check out www.thirdgen.org
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Old 12-28-2010, 08:18 AM
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Spohn used to make a torque arm for the ST10 and Muncie in 82-92 F-bods. I have no experience with it, but Spohn usually makes good stuff. I'll try to find it later and post a link
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