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  1. #1
    Join Date
    Feb 2005
    Location
    Central Florida
    Posts
    580
    Country Flag: United States

    Gearing a 9" and T56

    Ok here's my delimma--- I have an LS1 with a T56 (out of a 2000 SS Camaro) and I will be running a 9" with a 25.5" tall tire (315/30/18).


    How do I determine what Gear to run? If I use one of the online calculators-- do I use a 1:1 ratio or the .5 that 6th gear offers. I want strong acceleration with decent highway manners.

    If I run the calculator using .5 and 2000 RPMs at 65mph-- I am coming up with a gear of 4.50+. This does not seem feasible-- I would guess 1st and 2nd gears would be useless.

    Any suggestions?



  2. #2
    Join Date
    Oct 2005
    Location
    SoCal
    Posts
    489
    Depends what you want it to do, is it a street car or track rat? But with that awesome .50 OD you will be sub 2k rpm at 65mph

    For instance vipers run 3.07 gears stock and most guys with light mods change them out to 3.55.

    Personally I'd drop 4.10's in it and enjoy the wide gear ranges.

  3. #3
    Join Date
    Aug 2004
    Location
    Walla Walla, WA
    Posts
    1,546
    Country Flag: United States
    I've got an aftermarket T-56 with the 2.97 first gear, a .62 6th and 4.11's. First is a little short, but overall the gear spread is pretty nice. An LS1 T56 with the 2.66 first gear, a .5 6th with 4.11's would be a great combination.

  4. #4
    Join Date
    Jun 2002
    Location
    Long Island, NY
    Posts
    11,342
    Country Flag: United States
    Personally, I'd go with 3:73s or 3:90s. Get used to much lower crusing RPMS than 2,000 with a T56. At 65mph in my SS, I'm at 1500rpms. (3:42s, 26" OD tire). 2,000 rpms comes at 90mph.

  5. #5
    Join Date
    Nov 2002
    Location
    Wichita Falls,TX
    Posts
    2,555
    Quote Originally Posted by ProStreet R/T
    Personally I'd drop 4.10's in it and enjoy the wide gear ranges.
    That's what I did and it works fine.

  6. #6
    Join Date
    Aug 2003
    Location
    Prescott Valley, AZ
    Posts
    842
    me too with ls1 t56 and me much gusto!!!
    It's shake and bake!!! and i helped!
    Drewco Homes

  7. #7
    Join Date
    Sep 2004
    Posts
    184
    I like this gear ratio calculator. It gives you the starting line ratio and allows comparison of rpm and MPH for each gear.

    http://www.5speedtransmissions.com/gear_calculator.html