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Best Rear End Gears????

Discussion in 'Driveline' started by BRileyNV, Jan 18, 2019.

  1. BRileyNV

    BRileyNV Member Established Member

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    I'm looking to change the gears in my rear end and wanted to know what others are running to see what might be perfect. My car is going to be a street machine and might see the drag strip once or twice but mainly streets and highways. Any recommendations would be great!!!!

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  2. olympic

    olympic Well-Known Member Established Member

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    It's generally agreed that the stock 3.55's are about the best "all purpose" gears. Some owners have installed 3.73's with good results. Anything steeper is going to make first and second gear useless on the street.
     
  3. P49Y-CY

    P49Y-CY selfie deaths ftw Established Member

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    I have experimented with a few on my daily driven street/strip machines and found that 3.55 is the best for my coupe.

    Upper pulley only cars.
     
  4. me32

    me32 BEASTLY SHELBY GT500 TVS Established Member

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    What are your current mods and what are your future mods?
     
  5. GodStang

    GodStang Well-Known Member Established Member

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    Really depends on mods and power levels and driving styles. I was on 4.10s for awhile but being able to spin the tires at 80mph with ET Streets on sucked so when I went to the True Trac I went to 3.55 gears.
     
  6. BRileyNV

    BRileyNV Member Established Member

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    2.76 upper
    K&N intake
    60 lbs injectors
    Headers
    X-pipe
    Borla Stingers
    Kenne bell boost a pump
    SCT tune

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  7. slo984now

    slo984now AKA 01yellerCobra Established Member

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    That's actually good to hear. I kept going back and forth on installing a set of 3.73's I have on the shelf when I open the diff up. But I decided to keep the 3.55's since I'm happy with how the car performs. Although if there's any damage to the gears when I pull them I'll swap in the 3.73's since I have them.
     
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  8. P49Y-CY

    P49Y-CY selfie deaths ftw Established Member

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    yeah man, that sounds good. i do have 3.73's in my vert and i really like it. it's a little heavier, so i think they are perfect for the vert because it just gives it that little extra and are still fine on the highway.

    i had 4.10s in my coupe for a while, but they really were too deep. my problem with them though was not so much the lack of traction down low (i think that's the case with any gear in these cars lol, even with dr's), but it had the car winding out too much on the highway in 5th and 6th gear, when you want to just cruise.

    so the 3.55s def get my vote.
     
  9. BRileyNV

    BRileyNV Member Established Member

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    Thank you guys for all the info

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  10. Bdubbs

    Bdubbs u even lift bro? Established Member

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    600+ rwhp I think the stock 3:55 are best on the street.

    I like being able to hit 140 mph at the top of 4th gear, without spinning it to the moon.

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  11. Chris Arnold

    Chris Arnold Average guy Established Member

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    Optimal rear gear at the track takes you through the traps in 4th gear at your optimal shift point (redline in your case, I think). This is just a mathematical calculation and you can use an online gear/tire/speed calculator for.

    If you want to go with taller gears for the street (most do), then that's just personal preference at that point.

    So for example, if with 600-ish rwhp you can get a 130mph 1/4, then a 3.73 will probably just about right. It would hit redline (6500) at 133mph. But, this is only about a 5% difference from stock, which is hardly noticeable. So, I wouldn't make the swap from 3.55s.
     
  12. Corbic

    Corbic Well-Known Member Premium Member Established Member

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    Had 4.10, way to much. 1st and 2nd are worthless and sucks on the highway.

    Now have 3.31, not enough.
     
  13. tt335ci03cobra

    tt335ci03cobra Well-Known Member Established Member

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    3.55 for an Eaton car. If you check dyno sheets, you’ll see a trend that pulled Eaton setups peak before 6000rpm. My Eaton combo made 476whp at 5200rpm iirc. I had 4.10’s and started shifting at about 5750rpm. If I went out to 6500 the car would heat sink in 3 pulls even with cooling mods and made shit for power. The fall off was dramatic.

    If I was to do Eaton again, I’d keep a 3.55.

    Tops 3.73.

    I have a 3.73 now with a custom twin turbo setup that I set the fuel cut at 8,000rpm, stage 3 cam etc. My 3.73 in this application is like a 2.95 to 3.08 shifting at 6500rpm. Same like a gt350. Honest truth is gt350’s can take like a 4.30 to 4.56 rear with the 8200rpm redline and 28” tall tire.
     
  14. ShootyMCstabby

    ShootyMCstabby Brownie Hound. Established Member

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    3:55 here. And with the 6r80 swap I am spinning the tires. So I need a 3:15. or 3:08.
     
  15. me32

    me32 BEASTLY SHELBY GT500 TVS Established Member

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    Thats cause you have a 4.17 1st gear.
     
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  16. ShootyMCstabby

    ShootyMCstabby Brownie Hound. Established Member

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    Yeah I have a lot of things I don't brag about.
     
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  17. hotcobra03

    hotcobra03 Well-Known Member Established Member

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    I had 373 on stock setup.

    It put rpms up a little which kinda made the car more snappy to throttle

    I drive a lot and did go back to 355s
     

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