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

v6 t5

Old 01-31-2019, 11:22 AM
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Join Date: Oct 2007
Location: east tenn
Posts: 48
Car: 1987 pontiac firebird
Engine: 2.8
Transmission: 5 speed
Axle/Gears: 323 posi/disc from 86 gta
v6 t5

Hey guys and gals.I need some advice.!st off,sorry if this is not posted in the right place or way.Here is my question.I have a 2.8 in my 87 Firebird.I am going to purchase a rebuilt T.P.I sbc350 said to have 350hp.I want to know if I can use my t-5 and buy new clutch,flywheel,ect.If not I am trying to decide on a used T-56 or a new Tremic TKO 500.I have read the post where some say the t-5 will not last and others say they have high hp and still use a t-5.Any,all advice is appreciated.
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Old 01-31-2019, 12:00 PM
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Join Date: Oct 2004
Location: Henrietta NY
Posts: 3,809
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: v6 t5

You can use it but the gear ratios are designed for a V6 so they will be very short. It is also not that strong but can last if treated right.
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Old 01-31-2019, 03:18 PM
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Join Date: Sep 2015
Location: Knoxville, TN
Posts: 579
Car: 1988 IROC-Z
Engine: 350 TPI
Transmission: T56 swap ongoing
Axle/Gears: 2.77 9-bolt Posi
Re: v6 t5

I have a V6 T5 behind my L98.

Definitely poor gearing, particularly 1st, at 4.03. I'm shifting into 2nd before I even clear most intersections...part of the reason I have a T56 rebuilt, ready for me to install.
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Old 02-01-2019, 08:06 AM
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Re: v6 t5

What they all said:

You will not like it. And, it's the weeeeekest T-5 setup there is, which means, it'll be just that much more likely to fail in a very short time.

You can hack it together that way with a V8 bell housing and a 4.3 clutch disc, but start hunting down a T-56 swap.
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