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  • 2015 - 2023 (S550) Mustang -General/Talk

Rear Gear Ratios?

  • Thread starter Thread starter latamud
  • Start date Start date Jun 22, 2016

latamud

Founding Member
Oct 22, 2002
791
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19
Tampa, FL
Jun 22, 2016
#1
  • Jun 22, 2016
  • #1
hello,

I'm looking for different gear ratio options for the Super 8.8 in the S550 Mustangs. I'm finding 3.15, 3.31, 3.55 and 3.73. Are there other options available? I know this is odd but looking for 3.27s for a 1/2 mile event. We're thinking 3.31 will force us into 5th at the end. A 3.27 would let us run out through 4 th gear longer. Any suggestions?
 

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
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South Jersey
Jun 27, 2016
#2
  • Jun 27, 2016
  • #2
latamud said:
hello,

I'm looking for different gear ratio options for the Super 8.8 in the S550 Mustangs. I'm finding 3.15, 3.31, 3.55 and 3.73. Are there other options available? I know this is odd but looking for 3.27s for a 1/2 mile event. We're thinking 3.31 will force us into 5th at the end. A 3.27 would let us run out through 4 th gear longer. Any suggestions?
Click to expand...
Considering 5th gear in these cars is 1:1 (assuming you have a manual) is that a bad thing?
 

latamud

Founding Member
Oct 22, 2002
791
2
19
Tampa, FL
Jun 27, 2016
#3
  • Jun 27, 2016
  • #3
84Ttop said:
Considering 5th gear in these cars is 1:1 (assuming you have a manual) is that a bad thing?
Click to expand...
My 5th gear is a .80 for this application, my 4th gear is the 1:1.
 

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
5,222
3,254
204
South Jersey
Jun 27, 2016
#4
  • Jun 27, 2016
  • #4
latamud said:
My 5th gear is a .80 for this application, my 4th gear is the 1:1.
Click to expand...
2015-16 Mustang?
 

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
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3,254
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Jun 27, 2016
#5
  • Jun 27, 2016
  • #5
Transmission ratios for S550 as far as I'm aware:
Stock GT MT-82 ratios:
  • 3.66
  • 2.43
  • 1.69
  • 1.32
  • 1.00
  • 0.65
Stock V6 & I4 MT-82 ratios:
  • 4.24
  • 2.54
  • 1.66
  • 1.24
  • 1.00
  • 0.70
Stock GT and V6 Auto ratios:
  • 4.17
  • 2.34
  • 1.52
  • 1.14
  • 0.87
  • 0.69
 

latamud

Founding Member
Oct 22, 2002
791
2
19
Tampa, FL
Jun 27, 2016
#6
  • Jun 27, 2016
  • #6
2010 Viper TR6060. Custom application, we want to take advantage of the beefy 34 splined IRS from the S550.
 
Last edited: Jun 27, 2016

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
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Jun 28, 2016
#7
  • Jun 28, 2016
  • #7
Gotcha, You're pretty much stuck with the gear ratios you mentioned unless you start looking at the G force 9" housing for the 2015 subframe, but I think that's around 5k$
 

latamud

Founding Member
Oct 22, 2002
791
2
19
Tampa, FL
Jun 28, 2016
#8
  • Jun 28, 2016
  • #8
84Ttop said:
Gotcha, You're pretty much stuck with the gear ratios you mentioned unless you start looking at the G force 9" housing for the 2015 subframe, but I think that's around 5k$
Click to expand...
Right, that's what I've been seeing for the 9" prices. We're looking to do an economical alternative and we think the Super 8.8 can handle the job, if not better, and for less out of pocket. I was hoping Ford would continue the gear ratios for the 9" and 8.8 in this new Super 8.8. I think eventually it will trickle into the market as the demand increases.
I suppose production 3.31 with a taller tire would wind us down some. Will continue to monitor for new gear ratio offerings. Thank you for the responses.
 
Reactions: 84Ttop

Boosted92LX

It's only an inch or two. What's the big deal?
15 Year Member
Dec 19, 2010
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Jul 14, 2016
#9
  • Jul 14, 2016
  • #9
84Ttop said:
Gotcha, You're pretty much stuck with the gear ratios you mentioned unless you start looking at the G force 9" housing for the 2015 subframe, but I think that's around 5k$
Click to expand...

Hey, I actually have 3.27 gears in my turbo fox. I know that gear set was available at one time for an 8.8. I know that rear end is irs, but the diff is the same, right?
 

84Ttop

They make new pistons every day, so why worry?
5 Year Member
Jul 2, 2009
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Jul 19, 2016
#10
  • Jul 19, 2016
  • #10
Boosted92LX said:
Hey, I actually have 3.27 gears in my turbo fox. I know that gear set was available at one time for an 8.8. I know that rear end is irs, but the diff is the same, right?
Click to expand...
Completely different differential. The cases are actually different depending on auto or stick and depending on the ratio. Auto's have an aluminum housing while stick cars have a cast iron housing. The 3.15 gear ratio differential is also not interchangeable with 3.31/3.55/3.73 ratios. This new IRS 8.8 is being called the "Super" 8.8 and the parts while you would think are interchangeable are certainly not
 
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