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Old 06-05-2016, 12:04 AM   #1
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Rear end gear swap worth it

Hey guys so I procharged my 2014 v6 making about 410 rear wheel hp and 320 torque. I bought base manual transmission with 2.73. I hear 3.31 is ideal for Fi vehicles. Gts make roughly 430 flywheel and over 400 torque I'm guessing gear ratio on it is 3.31 base. Gt500 comes standard with 3.31 so my question is is it worth the swap? I live in la lots of traffic etc... I'm tempted to say my 2.73s are good enough? Any comments greatly appreciated. Thanks!



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Old 06-05-2016, 12:26 AM   #2
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I got 3.73 on my 14 GT that put down 426hp and 416tq and it pulls hard. I love the aggressiveness and drama that the 3.73s add to the car. Drove my friends 3.31 with little more power and wasn't very impressed with the acceleration feel. Im sure you would feel a huge difference going to 3.31 from a 2.73 but I dont know much about FI.
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Old 06-05-2016, 12:29 AM   #3
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Rear end gear swap worth it

I would say yes, especially if you want to feel the power.

I have 3.73s on my car and I love them, but for daily driving I wish 1st and 2nd were longer. Not to mention high way speeds the engine is around 2.1-3k.


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Old 06-05-2016, 12:46 AM   #4
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Going 70 currently at 1800 rpm and I feel like I'm lugging the engine... I don't know about crushing at 3000 lol



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Old 06-05-2016, 12:48 AM   #5
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Going 70 its at about 2200 or 2300 rpms. Not to bad, daily driving I do wish gears were a little longer but power was I love the 3.73.
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Old 06-05-2016, 09:06 PM   #6
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Quote:
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Going 70 currently at 1800 rpm and I feel like I'm lugging the engine... I don't know about crushing at 3000 lol

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Shouldn't be terrible, if I cruise on the low 2ks, you'll probably be right at 2k.

There's a chart somewhere that does some awesome math and breaks down speeds in different gears, can't seem to find it.

I'd go for it, I think 3.31s are perfect daily gears. Test drove a GT with them and it felt good, the 3.73s just had the oomph that I knew I'd eventually want.


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Old 06-05-2016, 11:38 PM   #7
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Ditto - if you want to enjoy that blower power, put the 3.31's in.
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Old 06-06-2016, 10:24 AM   #8
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I have only seen positive feedback on going with larger rear end gears for V6 models, but since I saw you replied that you which 1st and 2nd gear shift were longer I was wondering how the shift characteristics are for an automatic transmission with 3.73 gears. I am considering making such a change this year with associated tune. As always thanks for your time and feedback.
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Old 06-06-2016, 11:13 AM   #9
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remember the MT-82 has different 1st/2nd gears in GT's and V6's.

from a stock V6 with 3.31 I would prefer 3.55 and more so 3.73. It depends on where your powerband is and what you want to do with it. I like twisty two lane blacktop roads and with what I have 3rd gear is fun from 35-85. I would prefer it to be fun from 25-75.
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Old 06-06-2016, 06:02 PM   #10
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found an AM link and it covered gear ratio on FI vehicles ...
"
Anyway, just for reference, most forced induction street Mustangs run between a 3.08:1 and a 3.27:1 axle gear. There is enough power out of the hole and across the band that leaving the line nor high speed running is a problem."

This is what makes me think not to upgrade from the stock 2.73 as I'm basically there and the difference (I feel) will not be too noticeable.
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Old 06-06-2016, 10:40 PM   #11
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I never really looked into it but how would I find out what gears mine has?

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Old 06-06-2016, 10:43 PM   #12
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I never really looked into it but how would I find out what gears mine has?

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I think stock gt 3.31 if premium 3.73's?



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Old 06-07-2016, 09:58 AM   #13
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Get 3.55 on the FI manual


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Old 06-07-2016, 10:34 AM   #14
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Quote:
Originally Posted by king_13 View Post
There's a chart somewhere that does some awesome math and breaks down speeds in different gears, can't seem to find it.
This one?
The truth about gears..
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Old 06-07-2016, 10:48 AM   #15
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Quote:
Originally Posted by elkoritaNAY View Post
found an AM link and it covered gear ratio on FI vehicles ...
"
Anyway, just for reference, most forced induction street Mustangs run between a 3.08:1 and a 3.27:1 axle gear. There is enough power out of the hole and across the band that leaving the line nor high speed running is a problem."

This is what makes me think not to upgrade from the stock 2.73 as I'm basically there and the difference (I feel) will not be too noticeable.
If or when I swap my rear end gears it will be for 3.15's which I think would work the best on your car. The 2.73's aren't as bad as people say on a manual car verses an automatic.
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Old 06-07-2016, 11:54 AM   #16
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If or when I swap my rear end gears it will be for 3.15's which I think would work the best on your car. The 2.73's aren't as bad as people say on a manual car verses an automatic.

What's your torque? That's what's also important when considering gears. If you have 300tq at 1800 rpm that's completely different from having only 150tq at 1800.

Most coyote motors put down 400-420whp and 390-400wtq with minor mods. I've run 3.31 and 3.73 on mine and can tell you that on 27" or stock tires stick with 3.31 but if you run up on 28" tires then go up to 3.55 or 3.73.

People run lower gear ratios on forced induction but mainly it's when they're putting down easily another 100whp than your setup.

I'm moving to a new setup and can tell you how it does in about a week. 305/30/20 (27.4") with 3.73 gears.


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Old 06-07-2016, 07:23 PM   #17
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Quote:
Originally Posted by Bigshow14 View Post
If or when I swap my rear end gears it will be for 3.15's which I think would work the best on your car. The 2.73's aren't as bad as people say on a manual car verses an automatic.
Oh yes 2.73s are BAD on a manual! You really should get some seat time in 3.55s or 3.73s, you'll realize how terrible they are.
Our cars should have come minium 3.31s with 3.55s or 3.73s as an option.
3.7s lack tq.

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Old 06-08-2016, 08:27 AM   #18
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Gears are definitely worth the upgrade on a stock v6 manual. Anything wakes it up compared to the 2.73s.
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Old 06-08-2016, 09:28 AM   #19
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Torque is not high at all... 320 and yeah, I figured longer gears were for mustang beasts out there. I guess I'll have to see if I can ride on with anything, but the 2.73's (for comparative purposes). HP output is good, I am happy with that.
Like I previously posted, I feel the gears are not an absolute must on FI because of the power increase, this to me, negates the need for shorter gears because of lower HP #'s.




Quote:
Originally Posted by DallasStang77 View Post
What's your torque? That's what's also important when considering gears. If you have 300tq at 1800 rpm that's completely different from having only 150tq at 1800.

Most coyote motors put down 400-420whp and 390-400wtq with minor mods. I've run 3.31 and 3.73 on mine and can tell you that on 27" or stock tires stick with 3.31 but if you run up on 28" tires then go up to 3.55 or 3.73.

People run lower gear ratios on forced induction but mainly it's when they're putting down easily another 100whp than your setup.

I'm moving to a new setup and can tell you how it does in about a week. 305/30/20 (27.4") with 3.73 gears.


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Old 06-08-2016, 04:29 PM   #20
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Originally Posted by elkoritaNAY View Post
Torque is not high at all... 320 and yeah, I figured longer gears were for mustang beasts out there. I guess I'll have to see if I can ride on with anything, but the 2.73's (for comparative purposes). HP output is good, I am happy with that.

Like I previously posted, I feel the gears are not an absolute must on FI because of the power increase, this to me, negates the need for shorter gears because of lower HP #'s.

Saying gears is not an absolute must for forced induction mustangs is like saying all weight lifters should work with the same weights.

If your torque is 320 and if it comes anywhere north of 2500rpm then you still need less gearing. In your case you should get 3.73 ratio or 3.55 at the least. 3.55 would be the most useable in terms of acceleration and MPG.


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Old 06-08-2016, 04:36 PM   #21
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Another question is what's your redline? Having shorter gears and a low redline would make your car shift gears too often and will hurt your acceleration.

If my redline was a stock 6800rpm I would never get 3.73 gears cuz I would have to shift at like 57-58mph using 27.4" tires but with 27.4" tires I can still hit 66mph in second which doesn't hurt acceleration. Currently with 28.4" tires I can hit 47mph in 1st, 71mph in 2nd, 102mph in 3rd and 131mph in 4th. This is just too slightly tall for optimum acceleration for my power level.

With the new set up I will be able to hit 66mph in 2nd for 0-60mph runs, and top out at 122-123mph in 4th to trap just below that around 117-118mph.


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