Need help deciding on gear ratio

Discussion in 'Drivetrain' started by budd, Nov 7, 2014.

  1. budd

    budd New Member

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    Was wondering if I could get some ideas on what gear to go with. I've got a 97 GT 4.6 5spd, 126000 miles on it. It's still got the stock 3.27 gear. The car is basicaly stock other than 70mm tb and under drive pullies. It's not my daily driver but I do enjoy driving it as much as possiable. I'm sure I don't want 3.55's and I'm thinking 4.11's would kill my fuel mileage. I'm kinda wondering 3.73 or 3.90's? I guess what I'm asking, how much worse will the 3.90's hurt my mpg over the 373's and what rpm's be turning at 55-60 mph? Any HELP would surely be appreciated. THANK, Budd...
     
  2. Dsg94sn95

    Dsg94sn95 Member

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    Can't go wrong with 3.73.. They're ideal in a 5 speed but if it was an auto 4.10s would be best
     
  3. Ferocious

    Ferocious Legend SN95 Supporter

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    1. It's not your daily driver.
    2. It's a mustang, you didn't buy it with fuel economy in mind.
    3. 4.10s or go home.
     
  4. joekd

    joekd Well-Known Member

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    4.10's in my 96 GT 5 speed and if I remember right I was like 2300 RPM at 65mph
     
  5. chris91

    chris91 Well-Known Member

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    You're not going to see a big difference in gas mileage between 3.73's and 4 10's. The mod motors love the higher gear as well. As they say, never fear the gear.
     
  6. SnakeMedic

    SnakeMedic Member

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    THIS.
     
  7. g36 monkey

    g36 monkey Moderator Staff SN95 Supporter

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    Depending on cruising speed, the difference between 3.73 and 4.10 is like 2 mpg
     
  8. budd

    budd New Member

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    thanks all of you have been very helpfull. I guess I don't have to say that I'm pretty excited about this upgrade.
     
  9. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    3.73 will let you have a use able 1st
     
  10. DeepList

    DeepList Administrator Admin SN95 Supporter

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    I have 4.10s in mine and it's a 5 speed... I wouldn't consider anything else. If I cared about fuel economy, I would have bought a prius instead.
     
  11. cobra head

    cobra head Well-Known Member

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    for what u have I say 373 I have 410 with a ton of mods I hate them im ab to go with 355s but I have a lot of tq so its not going hurt me but it u do any kinda modding u will have to change the gears soooo I say 373
     
  12. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Mostly stock Gt 5spd max I would go is 3.73

    Cobra 5spd 4.10s.... they have a few more Rpms to play with
     
  13. Sinned83

    Sinned83 Well-Known Member

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    no way. I just went from 3.73's to 4.10's. I can barely notice any change in mpg. I'd go with the 4.10's
     
  14. g36 monkey

    g36 monkey Moderator Staff SN95 Supporter

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    I was saying the difference is pretty small. And depends on if you do a lot of highway or not. I do, and I would notice the difference going from my 3.73 to 4.10 right now. But in a mostly city car it would be hardly noticeable
     
  15. budd

    budd New Member

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    how much differance can I expect between 3.27's and 3.73, 2 - 3 ?? mpg's? The car does well as is but, I've been wantin more bottom end. Thank you guys for all you advice.
     
  16. Sinned83

    Sinned83 Well-Known Member

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    These cars get pretty good mpg it's not uncommon to hear of mid 20's. I doubt your talking a gallon even if you drive aggressive.
     
  17. budd

    budd New Member

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    Yea I've done as good as 25.8 all highway miles 55-60 mph. Combined depending on my foot I still think I'm @ 20-23. So I'm not affaid of losing a few, 3 or 4. Honestly I didn't buy it for economy but was surely suprised with it and have taken advantage of it. It doesn't do bad as is but, it's like now, I'm wantin to feel more bottom end.
     
  18. BOOOSTD

    BOOOSTD Active Member

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    I've had both and prefer the 373 for street....
     
  19. Mustang Mark

    Mustang Mark Well-Known Member

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    Go big or go home, 4.30s. My S197 has them and I still get 21-22 mpg on the highway cruising between 70-80.
     
  20. budd

    budd New Member

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    can you still use 1st gear?