Went from 3.73 to 3.23 and LOVE IT !!

Discussion in 'Transmission & Driveline Topics' started by slamdik, May 24, 2013.

  1. slamdik

    slamdik Member

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    So I changed my rear from a 3.73 to 3.23 and I'm very happy.

    MPG went from 7 to 13.8, that's right, DOUBLED with NO other changes.Much better on the highway too,3k rpm is about 67-68 mph.It's no overdrive but definitely takes the edge off.


    It realy does not feel "slower".It'll still get loose in 2nd from a roll and will hit the 6800 rev limiter in 1st in about 1 second.

    Maybe because it's a 4 hundie. I don't know. If it was a 190hp 305 monte ss It would prolly feel way slower but I can hardly tell the difference.

    BTW the whole 3.23 posi rear was $200 from craigslist ;)
     
  2. ratpatrol71z28

    ratpatrol71z28 Veteran Member

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    I'm happy for you. I'm currently debating either 373 or 342
     
  3. Gary S

    Gary S Administrator Lifetime Gold Member

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    3.23-3.42 is the best all around range for a street muscle car. You get lots of power to the rear wheels, but you still get nice highway cruising.
    Look back to many of the old Chevy muscle cars. Their most popular ratio was 3.31 which just happens to be right between 3.23 and 3.42.
     
  4. CDesperado

    CDesperado Veteran Member Lifetime Gold Member

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    I put in 3.73 on my car purely for the reason of not knowing whether i would prefer 3.42 or 3.73. I figure if I feel like the car is always wanting to launch into orbit I can always go to the 3.42's, but at least I won't wonder what the 3.73 would be like.
     
  5. hhott71

    hhott71 R.I.P 11/19/18 Lifetime Gold Member

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    4.10's are best, with an OD which = about 2.75 on the highway.
     
  6. HyPer

    HyPer Veteran Member Lifetime Gold Member

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    Most likely you had a low rpm torque monster already and didn't have a need for the low gears in the rear, so this ofcourse improved your all around performance. Gotta match your gears to what your engine is made to do, it's all about torque. HP sells cars, TQ wins races ;)
     
  7. theflash

    theflash Veteran Member Lifetime Gold Member

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    There's no way you were getting 7mpg with 3.73 with your combo, unless something was seriously wrong. I have 130 more cubes than you do with 4.10's and I get 9mpg
     
  8. HyPer

    HyPer Veteran Member Lifetime Gold Member

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    Well I got both of ya'll beat :screwup:

    I'm sitting at 350 cubes, 3.73 rear, and get 9 with just primaries running, and 6 when I link the secondaries to sync with primaries.
     
  9. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

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    Then you are running pig-rich with a poor tune that is costing you both gas money and power. I wouldn't brag.:)
     
  10. slamdik

    slamdik Member

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    You caught me.One of my most favorite things to do is post false mpg numbers on Camaro message boards.
     

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