Switched to 3.73 gears and not loving it

Discussion in 'High Performance Modifications' started by sinnyz_me, Jul 7, 2018.

  1. Zspoiler

    Zspoiler Veteran Member

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    I have driven Camaros with 3:73 and 3:42 `. And I prefer the 3:42`s because its a good compromise gear.Its gives you decent gas mileage with good performance, I have 377 cubic inch supercharged small block.Super T-10 trans,
     
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  2. sinnyz_me

    sinnyz_me Veteran Member

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    ok gotcha, what do you run in your car or what do you recommend?
     
  3. sinnyz_me

    sinnyz_me Veteran Member

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    Yes, I think it would worth it for sure.
     
  4. sinnyz_me

    sinnyz_me Veteran Member

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    What are your rpms at highway speed?
     
  5. Zspoiler

    Zspoiler Veteran Member

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    Around 2500 at 60 MPH with a 26 inch tall tire .right in its sweet spot, Got around 24 MPG.
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    I have a 200-4R with 3.42 gears. (255/60-15 tires on the rear.)
    It turns 2000 RPM @ 70 MPH.
    Your 3.73 gears would put it around 2250 RPM @ 70 with the same tires.

    A 700-R4 would be slightly higher RPM. (0.66 in the 200-4r Vs .7 OD in the 700R4 )

    It's getting hard to find a good 200-4R.
    700-R4 are still pretty common much if you have the means to do it once and right.... the 4L80E would be what I would look at first.
    I swapped mine to the 200-4R over a decade ago but you have more options available to you today.

    My son has 4.10 gears on his Camaro and he went with a 200-4R.
    He can actually comfortably run his at freeway speeds now.
     
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  7. NYH1

    NYH1 Veteran Member

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    Ever think of going with a Tremec TKO 5 speed? Depending on the trans. you choose, you can get a .64, .68 or .82 overdrive gear.

    Just a thought, NYH1.
     
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  8. Bandit723

    Bandit723 Veteran Member

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    700-R4's are good for cruising and do hold up if done right. For performance folks the 4L80E is attractive give a first 3 gear ratio as a TH400 and are beefy. Down side they are a bit heavy and are more costly to build.
     
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  9. ssupercoolss

    ssupercoolss Veteran Member

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    Overdrive trans are awesome.
     
  10. larrylarry

    larrylarry Veteran Member

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    I have a 700r4 in my 78 with 3.42’s. At 70 mph the rpm’s are 2200. I could easily switch to 410’s an still be lower than your rpm’s. 200r4 or 700r4 is the way to go but like said if you’re running a high HP/torque engine then a 4l80e would be the choice.
     
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