11.5:1 comp ratio 327 with a t-5 behind it. how long will the t-5 last?
from now untill long after you sell the car, or it might go south on the first launch.
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ICON Motorsports
1st & 3rd
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ICON Motorsports
1st & 3rd
Supreme Member
Joined: Nov 2000
Posts: 1,760
Likes: 0
From: Newark, DE
Car: 86' Z28
Engine: 355
Transmission: T-56
it depends on how you drive it. If you abuse it with 5000 rpm clutch drops and power shifts, then my guess is about a week. If you dont power shift and are somewhat polite on your launches you should get at least a couple years out of it before it goes (assuming its in good condition now). Ive had my BW t-5 behind my 350 for over a year now and its just starting to show signs of fatigue, but its probably got a ways to go before it completely goes out. *sigh* i guess its time for a t-56 
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My 1986 Z28 and more!!
85 IROC w/ 1364 miles!
R.I.P Dale Earnhardt

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My 1986 Z28 and more!!
85 IROC w/ 1364 miles!
R.I.P Dale Earnhardt
Member
Joined: Feb 2009
Posts: 186
Likes: 3
From: Independence, Kansas
Car: 1987 IROC-Z Convertable
Engine: 305 TPI
Transmission: 5 Speed BW T-5
Axle/Gears: 3.08 Posi
Re: 11.5:1 comp ratio 327 with a t-5 behind it. how long will the t-5 last?
I had a T-5 behind my 510HP/485ft lb 355 and I can tell ya, 3rd gear will go first. It just happened to us, but we knew that T-5 wouldn't hold, it was all a matter of how long. It lasted about 6 months and was wining pretty bad before my son took all the teeth off of 3rd a couple weeks ago. Now I am trying to get ahold of 5speedtransmissions.com. They offer (or offered, don't know if they are still in business) TKO600 conversion that WILL handle it, but I haven't heard back from them yet. Let ya know if I do here from them.
Member
iTrader: (9)
Joined: Aug 2009
Posts: 314
Likes: 0
From: Lafayette, IN
Car: 1989 GTA
Engine: pending install 383 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: 11.5:1 comp ratio 327 with a t-5 behind it. how long will the t-5 last?
I'm pushing 425/410 at the flywheel my t-5 has 80k on it and a hurst short throw. I've been driving the. At daily for three months with no issues. But I do not abuse my car. I built mine to cruise and that's what it does. If you built it to drag, go with a t56
Member
iTrader: (7)
Joined: Dec 2005
Posts: 276
Likes: 9
From: Beautiful Coastal New Jersey
Car: 1990 Firebird
Engine: 350 TBI
Transmission: T5
Axle/Gears: Auburn posi 3.73
Re: 11.5:1 comp ratio 327 with a t-5 behind it. how long will the t-5 last?
Well since this post is about 10 years old, I am sort of wondering if OP is still around and maybe he could tell us how long it lasted.
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