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Discussion Starter #1
Hi guys im a new member here and have been doing alot of research on what type of gears to put in my rear but no threads are really for a 6 spd t56 2002 gt, my car is pretty much stock except for borla stingers and stock h-pipe which i just recently had the cats removed from and now i want more bottom end and acceleration:D..i dont do much highway driving just usually around town and ive heard mixed reviews about each..my gears now feel rediculously long and i barerly ever even get into 5th let alone 6th, im just looking for what would give me the best all around acceraltion and perfomance..thanks
 

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Token asian guy
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Go for 4.10s if those are the only choices.
 

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Token asian guy
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What are you future plans for the car? Supercharger, turbo, drag race, DD, auto x? That'll give us a better idea of what you want and what advice we can give.
 

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Discussion Starter #5
if anything a supercharger and thats a long shot. i plan on just getting a jlt cai along with some type of tuner to help tune my new catless setup but nothing too rediculous
 

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Token asian guy
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Then just get the 4.10s, you'll be happy with them.
 

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with no other mods planned in the future i would go with the 4.10s. they are a ton of fun on the street but can be a pain in the butt when driving down the interstate. and i hope you do not think the t56 transmission is the factory trans in your car.
 

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Discussion Starter #9
lol it has a 2001 cobra trans swap thats why its a 6spd and has that extra top end so i would need steeper gears hence the 4:10's
 

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yeah since you got the 6 speed i would go 4.10s.... or **** it 4.30s. alotta people run 4.10s on a 5 speed so i dont see why you couldnt go for 4.30s or god forbid 4.56s (i believe?)
 

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US Air Force (retired)
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They made a bunch of different versions of the T-56 but I believe your sixth gear ratio is the same as a T-3650's fifth. 0.62:1. On a T-3650 there is a long jump between fourth and fifth. Your fifth gear fills the gap, 0.80:1 ratio. Fourth gear is 1:1 just like all the other Mustang GT transmissions. If you are running a 4v that spins higher you can run a steeper gear but if you're running a 2v then its the same as the rest of us. Your transmission doesn't really change things.
 

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lol it has a 2001 cobra trans swap thats why its a 6spd and has that extra top end so i would need steeper gears hence the 4:10's
01 cobras didnt have 6 speeds either...

+1

4:30's :D
+1!

They made a bunch of different versions of the T-56 but I believe your sixth gear ratio is the same as a T-3650's fifth. 0.62:1. On a T-3650 there is a long jump between fourth and fifth. Your fifth gear fills the gap, 0.80:1 ratio. Fourth gear is 1:1 just like all the other Mustang GT transmissions. If you are running a 4v that spins higher you can run a steeper gear but if you're running a 2v then its the same as the rest of us. Your transmission doesn't really change things.
The 5th gear being there is not the only difference. 1st gear is 2.97, instead of 3.38 like it is in the t3650. So running a steeper gear, like 4.30's, would be advisable IMHO.
 

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US Air Force (retired)
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I wasn't really thinking about first because on the street we just spin through first regardless of 3.73s, 4.10s or 4.30s.

Factoring in first gear with 4.30s, it wouldn't be quite as short as the T-3650 with 4.10s which some complain about. It would have about 92% of the rpms. (2.97/3.38x4.30/4.10). In fourth at 6000 rpms top speed would be around 104 mph. On the interstate in sixth he would be running around 5% higher rpms than a T-3650 with 4.10s but slightly lower rpms as a T-45 with 4.10s (.62/.67x4.30/4.10=98%). Some people find that acceptable.

I personally think that a T-45 with 3.73s has a high enough rpm going down the interstate. But, I drive a lot of interstate miles at 80 mph which is about 2700 rpm. His rpms would be around 6.6% higher than mine (.62/.67x4.30/3.73=1.066) so it would run around 2880 rpms. (If I did all these calculations right.)
 

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Discussion Starter #16
I was told it was out of a 2001 but who knows..so is it now safe to say that i would be alright goin with at least 4:10 gears then considering my longer first geear..and how would the 4:30's be at highway driving speeds?
 

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US Air Force (retired)
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I love that site. It does all the calculations for you. At 2500 rpms:

T-45/3.73s = 74.1 mph, with 4.10s = 67.4 mph.
T-3650/4.10s = 72.9 mph
T-56/4.10s = 72.9 mph, with 4.30s = 69.5 mph
 

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Bringing Yellow Back
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go with 410s they are fun lol

also i still traped 103mph in the 1/4 last weekend with a couple bolt ons and 410s
 
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