can't decide if its worth it 2.73 open to 3.42 posi

Discussion in 'Transmission & Driveline Topics' started by 351maverick, Sep 11, 2019 at 3:18 AM.

  1. black_aerocoupe

    black_aerocoupe Veteran Member

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    That's the textbook ideal rear for your (as-stock) vehicle unless you need to go back and run 0 offset wheels. Or need a strength upgrade.

    An '88 Formula starts life with a choked-head-intake ports engine, or a choked-port-intake-mani that is matched better to 3.42 than it would be to 4.10.

    Drivability around town and country is better with a 3.42. Unless you're putting mega hwy miles on, or otherwise prioritizing mileage and need to keep the 2.73, go for it, absolutely.

    A V8 '98 was an Auburn, with an SLP Torsen option. Ideally, a '99-02 rear has a standard (no frictions) Torsen, unless the car was SLP-"upgraded" to an Auburn those years.

    Your tach, speedo, math or all 3 are off.
     
    dave@ztech likes this.
  2. SRGN

    SRGN Veteran Member

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    Do it. You will notice the difference, and the car will be more fun to drive. I've gone from a 2.73 to a 3.23 and noticed a vast improvement. Plus the 4th gen rear disc brakes are much better.
     
  3. big gear head

    big gear head Veteran Member

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    Just a warning, if you have been doing one wheel burnouts and the tread on the right tire is less than the tread on the left tire then you need to replace the tires. If you use a LSD with tires that have uneven tread wear, unequal air pressure or different size tires then you will wear it out quickly and cause the oil to run hot.
     
  4. GoldenOne7710

    GoldenOne7710 Equal Opportunity Offender Lifetime Gold Member

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    I did a 2.56 swap to 3.42 ratio behind a TH350. Made all the difference in the world. Can't go wrong behind a 700R4.
     
    351maverick likes this.
  5. 80sz

    80sz Veteran Member

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    You done yet ??? What’s takin so long
     
    70-camaro likes this.

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