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

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Old Mar 11, 2008 | 01:14 AM
  #1  
Pontiacguy18's Avatar
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From: Fort Collins, CO
Car: 1991 Pontiac Firebird
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 3.42 posi
t5

Ok so I have a 91 firebird with a 305 tbi and a 700r4 tranny. I have always wanted it to be a manual but it was my dads car and he loves the 700r4, so what could I do? Well now its my car and its time for a t5. I have an 88 camaro as a donor car.

How hard is it to swap?
Will this year t5 essentially bolt on (crossmembers, bell housing, flywheel, ect.)?
do I need any change to my rear end or does it just bolt on to the driveshaft?

Any answers will help, I want to learn as much as I can before I take out the 700r4
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Old Mar 11, 2008 | 05:19 AM
  #2  
JamesC's Avatar
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: t5

You may find many answers in the following post:

https://www.thirdgen.org/forums/tran...y-t5-swap.html

JamesC
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Old Mar 11, 2008 | 10:20 AM
  #3  
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From: Northern California
Car: 1985 California Iroc
Engine: HSR ZZ4 0411 swapped
Transmission: 4L60E
Axle/Gears: 3.23 posi
Re: t5

if the doner car is a v8 then its a straight foward swap.
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Old Mar 12, 2008 | 01:55 AM
  #4  
dyed's Avatar
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Joined: Jul 2005
Posts: 71
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From: Kansas
Car: 84 Z/28
Engine: 350
Transmission: 700R4 - rebuilt by me
Axle/Gears: 3.73 posi
Re: t5

Rebuild the tranny before you put it in. Start saving to do it again, and again, and again.... you get the idea
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Old Mar 12, 2008 | 01:58 AM
  #5  
travishenry's Avatar
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Joined: Nov 2007
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From: Elverta, California
Car: 1988 Z28 Camaro
Engine: TPI 350
Transmission: TH350
Axle/Gears: 3.73 10 bolt
Re: t5

You have to cut a hole in the floor where the shifter will go. Then it should swap over if everything is there. Best of luck.
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Old Mar 12, 2008 | 10:38 AM
  #6  
vasquezmrysvll's Avatar
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From: Northern California
Car: 1985 California Iroc
Engine: HSR ZZ4 0411 swapped
Transmission: 4L60E
Axle/Gears: 3.23 posi
Re: t5

Originally Posted by dyed
Rebuild the tranny before you put it in. Start saving to do it again, and again, and again.... you get the idea
+1,000
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Old Mar 14, 2008 | 09:10 AM
  #7  
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Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Re: t5

Originally Posted by dyed
Rebuild the tranny before you put it in. Start saving to do it again, and again, and again.... you get the idea
Are you talking about an auto? Yes, those need to be rebuild every few miles.
Manuals hold up for hundreds of thousands of miles with no problems.
My T5 has close to 200k miles on it, no issues. My buddies T5 has over a 100k on it, no problem. *shrug*

Lou
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Old Mar 14, 2008 | 09:17 AM
  #8  
dyed's Avatar
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From: Kansas
Car: 84 Z/28
Engine: 350
Transmission: 700R4 - rebuilt by me
Axle/Gears: 3.73 posi
Re: t5

I haven't even put 4000 miles on my clutch car since I bought it and I've already grenaded two of them, world class no less. I guess they're fine if you don't intend to ever get your foot in it...
What it comes down to is this, even the strongest T-5's made, only came out rated to hold back 300 lb ft of torque. Even the mildest plain jane 350 is putting out better than that. As such, the factory T-5's may as well be disposable.
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Old Mar 14, 2008 | 09:25 AM
  #9  
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Car: '91 Z28 convertible
Engine: TPI
Transmission: T5
Axle/Gears: 3.27 posi disc
Re: t5

The T-5 wasn't meant to be abused by too much power. That's why GM never put it behind a 350.
If you put a strong enough engine in your car, you can break anything and then claim that the driveshalf for example or the rear end is "junk".

Power corrupts. (pun intended)

Lou
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