What rear end gears are you guys with T56's running?
#1
Junior Member
Thread Starter
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56
What rear end gears are you guys with T56's running?
I am about to do the swap and I am trying to decide between 3.73's and 4.10's.
#4
i will be going with 4.10s when i put in my six speed. there is plenty of overdrive in the six speed to keep highway driving at sane rpms. the more gear the better for acceleration
#5
Supreme Member
Join Date: Jan 2001
Location: Rock Hill, SC
Posts: 1,411
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1999 Pontiac T/A Firehawk
Engine: ***'s Engine
Transmission: T56
That's not the only issue.
In the quarter, you don't want to shift into an OD gear before crossing the traps. Ideally, you'll cross them just under redline in your 1:1 gear (that would be 4th for T5 and T56 guys).
If your trap speed is sufficiently high and your red line sufficiently low, you will run out of MPH in 4th gear before finishing the race. 4.10s would have been too much gear for me based on what I'm eventually going to run, so I went with 3.89.
As an example:
Consider a hypothetical car with a 5500 rpm redline, 4.11s, and 245/50-16 tires. At redline in 4th, the maximum speed is ~102 mph. If you trap higher than that, you'll have to shift into 5th. With 3.89 gears, it's almost 108mph. Change to 27" tires, and it's close to 114mph. Raise the redline to 6000, and it's 124mph...
In the quarter, you don't want to shift into an OD gear before crossing the traps. Ideally, you'll cross them just under redline in your 1:1 gear (that would be 4th for T5 and T56 guys).
If your trap speed is sufficiently high and your red line sufficiently low, you will run out of MPH in 4th gear before finishing the race. 4.10s would have been too much gear for me based on what I'm eventually going to run, so I went with 3.89.
As an example:
Consider a hypothetical car with a 5500 rpm redline, 4.11s, and 245/50-16 tires. At redline in 4th, the maximum speed is ~102 mph. If you trap higher than that, you'll have to shift into 5th. With 3.89 gears, it's almost 108mph. Change to 27" tires, and it's close to 114mph. Raise the redline to 6000, and it's 124mph...
Last edited by 99Hawk120; 02-27-2002 at 03:48 PM.
#6
Umm as long as you don't get 2.77s. Believe me on that one 2.77s and t56 suck. 1st gear feels good but 2nd is a dog. If you have a stock tpi I'd get 3.42s, and if you have a modded tpi intake I'd get 3.73s. If your not running tpi, I'd get 3.73s-4.10s if you have a high redline.
#7
Member
![](https://www.thirdgen.org/forums/images/ranks/tgo10.gif)
Join Date: Dec 2000
Location: Glen Burnie, MD USA
Posts: 335
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 IROC
Engine: 350
Transmission: T56
I have been running a 2.77 nine bolt since I put the T56 in last summer. Believe me, you do not want to have 2.77s, they really do suck. I am just trying to get some money together to get to Miles for some gears and a carrier, hopefully I will get it done early this summer.
Tim
Tim
![Big Grin](https://www.thirdgen.org/forums/images/smilies/biggrin.gif)
Thread
Thread Starter
Forum
Replies
Last Post
hectre13
Engine/Drivetrain/Suspension Parts for Sale
2
12-11-2023 08:14 AM
AkDrifted
Engine/Drivetrain/Suspension Parts for Sale
6
08-17-2015 07:45 PM
novaderrik
Transmissions and Drivetrain
3
08-10-2015 12:44 PM
1992 Trans Am
Engine/Drivetrain/Suspension Parts for Sale
1
08-08-2015 08:16 PM