3.27 vs 3.73 with a T5
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Supreme Member
Joined: Oct 2004
Posts: 4,527
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
3.27 vs 3.73 with a T5
I have a set of 3.73 gears in a 10 bolt now. I am looking at a 9 bolt with 3.27, I was wondering how much difference will I notice?
Sometimes I do feel the 3.73 are a little short but I am not sure, anyone have any experience?
Sometimes I do feel the 3.73 are a little short but I am not sure, anyone have any experience?
Joined: Feb 2001
Posts: 8,494
Likes: 411
From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: 3.27 vs 3.73 with a T5
I have a 3.27 right now with a T5 and a long tube runner intake. With the torque and low revs, I think I "might" go to a 3.45, but I like the 3.27.
....I would imagine with a carb, you'll want to stay with the 3.73.
....I would imagine with a carb, you'll want to stay with the 3.73.
Joined: Jun 2004
Posts: 911
Likes: 29
From: Las Vegas
Car: '88 Trans Am
Engine: 5.7L TPI
Transmission: Slushbox
Axle/Gears: 3.27
Re: 3.27 vs 3.73 with a T5
I had 3.27s then went to 3.45s huge difference never did 3.73s. For just a bolt on car she ran 13.77 at 3700'da and ran 13.1 in Houston all on radials
Thread Starter
Supreme Member
Joined: Oct 2004
Posts: 4,527
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 3.27 vs 3.73 with a T5
Joined: Jul 2000
Posts: 6,521
Likes: 91
From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: 3.27 vs 3.73 with a T5
Is your powerband similar to the L69 (shift in the low 5000s rpm) or higher? It doesn't take much cam to push it up higher.
If it's a 2.95 / .63 geared T5, I would continue with the 3.73s unless you want a highway-use car.
If it's a 2.95 / .63 geared T5, I would continue with the 3.73s unless you want a highway-use car.
Joined: Jun 2004
Posts: 911
Likes: 29
From: Las Vegas
Car: '88 Trans Am
Engine: 5.7L TPI
Transmission: Slushbox
Axle/Gears: 3.27
Re: 3.27 vs 3.73 with a T5
Oh and my tyranny selection was from the TBI 305 cars since it had a steeper 1st gear
Thread Starter
Supreme Member
Joined: Oct 2004
Posts: 4,527
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 3.27 vs 3.73 with a T5
Yes the powerband is 1800 to 6000 and it is a 2.95 / 0.73 trans
I mostly use it for a summer runner when I am not on a motorcycle.
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Joined: Jul 2000
Posts: 6,521
Likes: 91
From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: 3.27 vs 3.73 with a T5
If it is the .73 fifth, pull it and swap that to the .63 fifth. Problem solved and gas money saved.
Joined: Jun 2004
Posts: 911
Likes: 29
From: Las Vegas
Car: '88 Trans Am
Engine: 5.7L TPI
Transmission: Slushbox
Axle/Gears: 3.27
Re: 3.27 vs 3.73 with a T5
The TBI cars had a different gear ratio than the the TPI cars.... my car launched 1.93 60' times with the TPI granny and was 1.73 with the 91 TBI granny.
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