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Grimace427

Gears, Gears, Gears

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This page will be all about gear ratios, RPM's, tire height, and what works for which situation.

 

The calculator I use is here.

 

Stock GT MT-82 ratios:

  • 3.66
  • 2.43
  • 1.69
  • 1.32
  • 1.00
  • 0.65

 

Stock V6 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

 

Common available rear gear ratios:

  • 2.73
  • 3.15
  • 3.31
  • 3.55
  • 3.73
  • 4.10

 

Stock tire sizes and their overall height:

 

  • 225/60/17(27.6")
  • 235/50/18(27.3")
  • 245/45/19(27.7")
  • 255/40/19(27.0")

 

Common drag tire sizes:

 

  • 275/50/15(26")
  • 275/60/15(28")
  • 275/40/17(25.7")
  • 295/45/17(27.5")
  • 285/40/18(27")
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GT 5.0 average trap speeds between 110-115mph

 

-Manual transmission

  • With 3.31 rear ratio and 27" tires: 6.000-6,250rpm in 4th gear
  • With 3.55 rear ratio and 27" tires: 6,400-6,700rpm in 4th gear
  • With 3.73 rear ratio and 27" tires: 6,700-7,000rpm in 4th gear

 

  • 3.31 rear ratio and 26" tires: 6,200-6,500rpm in 4th gear
  • 3.73 rear ratio and 28" tires: 6,500-6,800rpm in 4th gear

 

 

 

V6 average trap speeds between 100-105mph

 

Manual transmission

  • 2.73 rear ratio and 27" tires: 5,700-5,900rpm in 3rd gear
  • 3.31 rear ratio and 27" tires: 6,900rpm in 3rd gear to 5,300rpm in 4th gear
  • 3.55 rear ratio and 27" tires: 5,500-5,700rpm in 4th gear
  • 3.73 rear ratio and 27" tires: 5,700-6,000rpm in 4th gear
  • 4.10 rear ratio and 27" tires: 6,300-6,600rpm in 4th gear

 

  • 3.31 rear ratio and 26" tires: 7,000rpm in 3rd to 5,550 in 4th
  • 3.73 rear ratio and 26" tires: 5,950-6,200rpm in 4th gear
  • 4.10 rear ratio and 26" tires: 6,500-6,950rpm in 4th gear
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GT automatic ratios and trap speeds(110-115mph):

  • 3.15 rear ratio and 27" tires, 6,550-6,850rpm in 3rd gear
  • 3.55 rear ratio and 27" tires: 5,550-5,800rpm in 4th gear
  • 3.73 rear ratio and 27" tires: 5,800-6,100rpm in 4th gear
  • 4.10 rear ratio and 27" tires: 6,400-6,700rpm in 4th gear
  • 3.55 rear ratio and 26" tires: 5,750-6,000rpm in 4th gear
  • 3.73 rear ratio and 26" tires: 6,050-6,300rpm in 4th gear
  • 4.10 rear ratio and 26" tires: 6,650-6,950rpm in 4th gear


V6 automatic ratios and trap speeds(100-105mph)

  • 2.73 rear ratio and 27" tires: 5,200-5,400rpm in 3rd gear
  • 3.31 rear ratio and 27" tires: 6,250-6,600rpm in 3rd gear
  • 3.55 rear ratio and 27" tires: 6,700-7,000rpm in 3rd gear
  • 3.73 rear ratio and 27" tires: 5,300-5,550rpm in 4th gear
  • 4.10 rear ratio and 27" tires: 5,800-6,100rpm in 4th gear

 

  • 3.31 rear ratio and 26" tires: 6,500-6,800rpm in 3rd gear
  • 3.73 rear ratio and 26" tires: 5,500-5,750rpm in 4th gear
  • 4.10 rear ratio and 26" tires: 6,050-6,300rpm in 4th gear

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Modified naturally aspirated 5.0 trap speeds 115-122mph, 7,500rpm redline

 

Manual trans

  • 3.31 rear ratio with 26" tires: 6,500-6,900rpm in 4th gear
  • 3.73 rear ratio with 28" tires: 6,800-7,200 rpm in 4th gear
  • 3.90 rear ratio with 28" tires: 7,100-7,500rpm in 4th gear(just barely)

 

Auto trans

 

  • 3.15 rear ratio with 26" tires: 7,100-7,500rpm in 3rd gear(just barely)
  • 3.15 rear ratio with 28" tires: 6,600-7,000rpm in 3rd gear
  • 3.73 rear ratio with 26" tires: 6,300-6,700rpm in 4th gear
  • 4.10 rear ratio with 26" tires: 6,950-7,400rpm in 4th gear

 

 

Modified naturally aspirated 3.7 V6 trap speeds 105-112mph, 7,500rpm redline.

 

Manual trans

  • 3.31 rear gear with 26" tires: 7,500 in 3rd-5,900rpm in 4th
  • 3.55 rear gear with 26" tires: 5,900-6,300rpm in 4th
  • 3.73 rear gear with 26" tires: 6,200-6,650rpm in 4th(z28th1s setup)
  • 4.10 rear gear with 26" tires: 6,850-7,200rpm in 4th

 

 

Auto trans

  • 3.31 rear ratio with 26" tires: 6,800-7,300rpm in 3rd gear
  • 3.55 rear ratio with 28" tires: 6,800-7,250rpm in 3rd gear
  • 4.10 rear ratio with 26" tires: 6,350-6,750rpm in 4th gear
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5.0 forced induction, 125-135mph, 7,500rpm redline.

 

Manual trans

 

  • 3.31 rear ratio with 28" tires: 6,550-7,100rpm in 4th
  • 3.55 rear ratio with 28" tires: 7,050-7,500rpm in 4th

 

Auto trans

 

  • 3.15 rear ratio with 28" tires: 7,200 in 3rd to 5,800rpm in 4th
  • 3.55 rear ratio with 28" tires: 6,100-6,550rpm in 4th

  • 3.73 rear ratio with 28" tires: 6,400-6,900rpm in 4th

  • 4.10 rear ratio with 28" tires: 7,000-7,500rpm in 4th(just barely)

 

 

V6 Forced induction, 115-125mph, 7,500rpm redline

 

Manual trans

  • 3.55 rear ratio with 26" tires: 6,550-7,100rpm in 4th
  • 3.73 rear ratio with 26" tires: 6,900-7,500rpm in 4th
  • 4.10 rear ratio with 28" tires: 7,000-7,500rpm in 4th(just barely)

 

Auto trans

 

  • 3.31 rear ratio with 28" tires: 6,950-7,500rpm in 3rd
  • 3.73 rear ratio with 26" tires: 6,300-6,850rpm in 4th
  • 4.10 rear ratio with 26" tires: 6,950-7,500rpm in 4th(just barely)
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S197-spec Tremec Magnum ratios.

http://www.jpcracing.com/tremec-magnum-xl-s197-conversion/

 

 

Close:

  • 2.66
  • 1.78
  • 1.30
  • 1.00
  • 0.74
  • 0.50

 

Wide:

  • 2.97
  • 2.10
  • 1.46
  • 1.00
  • 0.80
  • 0.62

 

 

Trap speeds of 115mph:

Close ratio with 26" tire and 3,73 rear gear.........7,200rpm in 3rd

Close ratio with 26" tire and 4.10 rear gear.........6,100rpm in 4th

Close ratio with 28" tire and 3.73 rear gear.........6,700rpm in 3rd

Close ratio with 28" tire and 4.10 rear gear.........5,650rpm in 4th

 

Wide ratio with 28" tire and 3.73 rear gear..........7,500rpm in 3rd

Wide ratio with 26" tire and 4.10 rear gear..........6,100rpm in 4th

 

 

Trap speeds of 120mph

Close ratio with 26" tire and 3.73 rear gear.........7,500rpm in 3rd

Close ratio with 26" tire and 4.10 rear gear.........6,350rpm in 4th

Close ratio with 28" tire and 3.73 rear gear.........7,000rpm in 3rd

Close ratio with 28" tire and 4.10 rear gear.........5,900rpm in 4th

 

Wide ratio with 26" tire and 3.73 rear gear..........5,800rpm in 4th

Wide ratio with 26" tire and 4.10 rear gear..........6,350rpm in 4th

Wide ratio with 28" tire and 3.55 rear gear..........7,450rpm in 3rd

Wide ratio with 28" tire and 4.10 rear gear..........5,900rpm in 4th

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Stock tire sizes and their overall height:

 

  • 225/60/17(27.6")
  • 235/50/18(27.3")
  • 245/45/19(27.7")
  • 255/40/19(27.0"

 

 

 

Cough Cough*** My rears are 285/35/R19

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Stock '10-12 GT500 gear ratios

 

  • 2.97
  • 1.78
  • 1.30
  • 1.00
  • 0.74
  • 0.50

 

 

Stock '13-14 GT500 gear ratios

 

  • 2.66
  • 1.82
  • 1.30
  • 1.00
  • 0.77
  • 0.50

 

Stock tire sizes:

 

  • 285/35/19(26.9")
  • 285/35/20(27.9")

 

to be continued.....

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Tremec Magnum ratios.

 

Close:

  • 2.66
  • 1.78
  • 1.30
  • 1.00
  • 0.8O
  • 0.63

 

Wide:

  • 2.97
  • 2.10
  • 1.46
  • 1.00
  • 0.74
  • 0.50

 

 

 

Peter,

 

The ratios for a standard T-56 mag wide ratio are correct, but the wide ratio S-197 T-56 mag that is in my car is different 5th and 6th.  It has a 80 5th and  0.63 6th.  EDIT: For some reason instead of allowing me to type point eighty, it is showing the little guy shooting himself in the head.  Hahaha

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Does anyone use 3.90s? I would have gone with those if Ford Racing offerd them. I didn't want to go as deep as 4.10s, so the 3.73s seemed like a match for what I was looking for.

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Peter,

 

The ratios for a standard T-56 mag wide ratio are correct, but the wide ratio S-197 T-56 mag that is in my car is different 5th and 6th.  It has a 80 5th and  0.63 6th.  EDIT: For some reason instead of allowing me to type point eighty, it is showing the little guy shooting himself in the head.  Hahaha

 

 

Yeah strange I went off Tremec's website for the ratio's and thought they were the S-197 specs but checked the JPC site and you are correct. The ratios have been edited.

 

 

 

And yes trying to type 0.80 goes wonky so I use a capital O instead of 0. I'll check with the site operator to see about disabling typed emoticons.

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A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on!

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A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on!

 

I saw that posted!!  So you are the 'lucky' person!!

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A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on!

Man, I haven't seen one of those kind of good deals in a looooong time. Ah, the good ol days. lol

 

I'm getting old :Big Grin:

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This is some good information. Seems like the 3.31 gears are the sweet spot for forced induction for the v6's.

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