Transmissions and Drivetrain Need help with your trans? Problems with your axle?

2.8 tranny swap

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Old Aug 7, 2002 | 07:56 PM
  #1  
Bebefouch's Avatar
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From: Prince Albert, Sask., Canada
2.8 tranny swap

Alright heres the situation. After killing 2 trannies in my '84 2.8 v6 berlinetta (both 700r4's), me and my dad picked up a th-350. Comparing it with another one of the trannies, it looks much smaller and its clearly shorter than the 700r4's. We're positive it will bolt right up but are we gonna need the driveshaft from a car that came with a th-350? I'm kind of a newbie at this stuff so go easy on me thanks in advance
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Old Aug 7, 2002 | 09:47 PM
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JoelOl75's Avatar
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
A T350 trans won't bolt up to the 2.8 (60 degree v6) motor.
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Old Aug 7, 2002 | 10:34 PM
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firechicken_3's Avatar
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From: Clinton, IA usa
Car: 1984 Firebird
Engine: 350 Terminator EFI
Transmission: T56
Axle/Gears: 4.10
unless he get one that has a BOP bell housing pattern, i think those exist don't they?

to clarify
BOP = buick, olds, pontiac, engine
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Old Aug 8, 2002 | 03:41 AM
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Bebefouch's Avatar
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From: Prince Albert, Sask., Canada
This transmission is a 3 speed transmission, it has been taken out of an early 3rdgen v6 camaro (82,83). The bell housing bolt pattern is identical to the one on the 700r4. Like I said before, were positive it will bolt right up to the 2.8. The only difference is that the output shaft on this 3 speed transmission (its gotta be a th350) is a lot shorter (about 3 inches) and I just need to know if I will need the driveshaft from a car that came with this transmission. Excuse me if i'm confusing anyone.
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Old Aug 8, 2002 | 08:03 AM
  #5  
firechicken_3's Avatar
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From: Clinton, IA usa
Car: 1984 Firebird
Engine: 350 Terminator EFI
Transmission: T56
Axle/Gears: 4.10
yes you will need the drive shaft from the car the trans came from,

and as far as the trans, it is not a th350

but it is a 200c, or 200 metric as some call it, it is weaker than a 700r4, if i recall correctly
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Old Aug 8, 2002 | 01:41 PM
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TomP's Avatar
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Yeah, you'd be better off with another 700r4 than the metric 200C. What years were those 700r4s? '83-'84 700r4's were GM's first attempts (V8's got them in '83, V6's got them in '84), and they're not the best. GM improved them in 85, but they still had problems. In '87, GM fixed a ton of problems with the 700r4.

Try to get the newest 700r4 you can. For example, if you had to choose between an '85 700r4 and a 92 700r4, get the 92. But try as hard as you can to get at least an '87 700r4. Hopefully you can find a junkyard that won't charge too much. And remember it's gotta come out of a 2.8/3.1 car, either an f-body, or a Blazer. (You might have to swap governors (shift points) and tailshafts if you get a Blazer trans.)

Good luck, I know how you feel; I'm on my 3rd 700r4 right now- and it's getting ready to die. I plan on getting an 87-up 700r4 from a junkyard, rebuilding it, and putting it under my '86.

Remember to flush the trans cooler lines before reinstalling any transmission. You don't want the leftover metal in the cooler lines to ruin the "new" trans. Also, get a rebuilt torque convertor- it's the only way to get the metal shavings out of the TC. They're stuck in there, and the TC would have to be cut open, cleaned, and welded back together. A rebuilt TC is only about $80.
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