POS T5 - Third Generation F-Body Message Boards

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


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Old 12-09-2001, 10:34 PM   #1
Thread Starter
Join Date: Nov 2001
Location: MNT.Washington, KY
Posts: 401
Car: 87 Iroc
Engine: L98
Transmission: T-5 3.42's


ok, i have a 87 iroc with a l98 350. The motor has been built and is cranking 350 hp.
Now, I have the original t5 that came in the car. My 3rd gear has been rebuilt like 3 times. What is wrong with it.
Im gonna rip it out and I want to go with T-56 or a muncie M-20.
What do you recomend for a Iroc?
When I rip out my T-5 how much do you think I can get for it?
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Old 11-11-2017, 12:29 PM   #2
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iTrader: (4)
Join Date: Jul 2000
Location: Aridzona
Posts: 5,814
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Re: POS T5

The rollers in the back of the maindrive (input) support the pilot end of the mainshaft poorly.

When the front end of the mainshaft isn't supported, the 3rd speed gear and countershaft gear aren't held stable to each other and break teeth.

There were a few Ford models with a tapered roller bearing at the input / mainshaft. It is a mod that can be done on a GM input and mainshaft.
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Old 11-14-2017, 04:54 PM   #3
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Join Date: Oct 2004
Location: Henrietta NY
Posts: 3,428
Car: 1984 Trans Am L69
Engine: 355 Carbed V8 Patriot Vortec Heads
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi

Re: POS T5

This is a well known problem Either get a LT1 T56 or contact gforce or astro and get them to upgrade the T5
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