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Thread: 3.27 vs 3.73 gearing

  1. #1
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    3.27 vs 3.73 gearing

    Any gains to justify the cost of a regear from 3.27 to 3.73?

    I currently have 3.27 in my 8.8 and auto trans 5.0. But I also have a set of 3.73 sitting on the shelf. I was about to sell them unless I can find some good positive gains to justify the regear cost to use them. I know in other stangs 2.73 to 3.73 was great but I fear I wouldnt be as happy with the money spent on this.

    I would love 4.10's but with my highway RPM already at 2200-2500 (IIRC) at 80 I think 4.10 would just be too high of a cruising RPM

    Thoughts? any real world gains experience?

  2. #2
    RRT juice_man_86's Avatar
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    Wouldn't even be a question for me....I'd go 3.73 all day

    Sent from my Moto G
    2014 Mustang GT m6 - 12.97@111
    All stock down to the tires
    12.53 on slicks. Stock. No tune.

    1986 Mustang 5 speed - 12.10@110 off the sauce
    11.05 on Nitrous babying a hurt t-5

    327 stroker BOSS block with junk Pro Comp heads
    355hp n/a
    520hp on nitrous

    All Nitrous parts are gone. Turbo on the way

    Tuned by Tim @ Rodeheavers Hotrod & Dyno Shop

  3. #3
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    get the gears changed out and get a tune (if you do not already have one). will probably be the greatest day of your life...
    2012 5.0 bolt on Lund tuned
    -Wild Bill

  4. #4
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    2.73s to 3.55s was a great wake-up call for my car years ago. With overdrive I'd think 3.73s would do more food than harm.

  5. #5
    Senior Member Darren's Avatar
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    All my cars were 3.73. Wouldn't have it any other way.
    2013 School Bus Yellow Boss 302
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    -LED Interior Lights, 15% Tint, Carbon Fiber this and that.
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    1983 Black GT Hatch 5.0 - Sold
    2011 Sterling Gray GT - Sold
    2010 Candy Red Metallic GT - Sold
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  6. #6
    No Traction due to Paxton PaxtonShelby's Avatar
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    I love 3.73's in a stick car. No experience with an auto - but unless you are doing a lot of highway driving I can't see a downside of 3.73's in an auto.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  7. #7
    Senior Member Dan B.'s Avatar
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    I'm a fan of 3.55's in all my cars. My 2001 F-150 (auto), '88 T-bird (5 speed) and Ranger (C4) all have them and make a nice cruising gear all around.
    Quote Originally Posted by John4cam View Post
    Ahh fuque
    1985 Ranger--2WD, basic bolt-ons and tires, 11.92 @ 111mph.

    1986 Ranger--2WD, 5.0/T5/8.8.

  8. #8
    Senior Member Darren's Avatar
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    I even had 3.73 in my 2000 GT (automatic) and it was still very livable and fun!
    2013 School Bus Yellow Boss 302
    -Recaros, Torsen #0054
    -Ford Boss Springs, BMR Upper/Lower Control Arms, Panhard Bar
    -LED Interior Lights, 15% Tint, Carbon Fiber this and that.
    -JLT, Lund nGauge
    2016 Ford Focus ST - Kona Blue - DD
    -ST3, Recaros, Nav, Roof etc
    -Springs, Tint, Mountune Intake


    1983 Black GT Hatch 5.0 - Sold
    2011 Sterling Gray GT - Sold
    2010 Candy Red Metallic GT - Sold
    2004 Competition Orange Mach 1 - Sold
    2000 Silver GT - Sold
    1969 Candy Apple Red Mustang Coupe - Sold

  9. #9
    Springin' It cLockWise's Avatar
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    3.73's in a Manual are about the equivalent of 4.10's in an Automatic. 3.73's are a pretty fun gear to have, especially when I drove my cousins boosted GT a few times. If you're still worried about having a good cruising gear, get the 3.55's. You'll still have the added acceleration and have a livable 5th gear (in my opinion).


    JLT TRU CAI|ACCUFAB 70MM TB|PP PLENUM|MAGNAFLOW CATTED TRU-X|MAGNAFLOW PERFORMANCE EXHAUST

  10. #10
    No Traction due to Paxton PaxtonShelby's Avatar
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    But this is an auto...no 5th gear.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  11. #11
    Springin' It cLockWise's Avatar
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    Hmm my bad. I forgot it was an auto :(


    JLT TRU CAI|ACCUFAB 70MM TB|PP PLENUM|MAGNAFLOW CATTED TRU-X|MAGNAFLOW PERFORMANCE EXHAUST

  12. #12
    25 in the 1/4 SlowSix's Avatar
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    for an N/A car I enjoyed my 4.10s with both an auto and a manual - I've had both in the same car.


    Just a little 500 whp V6

  13. #13
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    seems the general consensus is to slap them in. Guess I will hang on to them and pull the axle sometime and go have them installed.

  14. #14
    25 in the 1/4 SlowSix's Avatar
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    Fwiw, going from 3.27s to 4.10s only changed my overdrive cruising rpm by maybe ~250 rpm. I think 70 is around 2500?

    There are rpm calculators you can figure it out with.


    Just a little 500 whp V6

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