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Thread: 4.56s??

  1. #1

    Default 4.56s??

    Hello all, just wondering if anybody has thrown 4.56s in a t56 car? Or reasons why you shouldn't do that.

  2. #2
    "The Hammer"


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    Default

    For a street car I would stay away. Your cruising rpm's will be high and it will drink fuel like a fat kid eats twinkies. I had a car with 4.56's in it, 1st was useless, 2nd was almost useless and I think I could have started the car from a dead stop in 4th if I really had wanted to.
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    Default

    4.10s were about the max that I would do. Had them in my old 10 bolt. They were fun. UNLESS ur running some super tall tire, I wouldnt go any steeper. 1st realy was no longer necessary with the 4.10s

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  4. #4

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    Maybe if you were running a 29" rear tire and the motor was built to spin real high like Taner's. For a street car with a 7k cap, it would be a waste.
    '94 coupe, 10.15 at 133.65 414" LT1, 4500 stall, n/a, pump gas, mufflers, street trim
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  6. #5
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    I don't think I would go that high , I have 4.30s and love them , I don't think 1st gear feels that short in my car even with a 25 tall tire . also I need a 28 inch tire in the 1/4

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    Just to put things in perspective, with a 94 and up T56 (93 ratios are all different), running 26" tires:

    RPM @ 70 MPH in 6th gear:

    3.42 - 1,550 RPM
    3.73 - 1,690 RPM
    4.10 - 1,855 RPM
    4.56 - 2,065 RPM

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  9. #7
    Asshole.


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    I'm going to be the devil's advocate and say if you don't mind high RPMs on the highway and like to row the gears, then do it. It's your $$

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    @6 speed impy has them with his t56 conversion in his SS.

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    Quote Originally Posted by jaysz2893 View Post
    @6 speed impy has them with his t56 conversion in his SS.
    My bro set it up that way, and also runs a taller 275/50/17, which is somewhat oddball, but it helps that big tank move but is like 2100 or so at 75

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    Default

    The only reason I would shy away from a 4.56 gear in the 10 bolt would be pinion size. 4.56 gears would have to have a very small pinion. The difference between 3.42 and 4.10 is pretty amazing, let alone going to a 4.56. If you are making much power at all, the teeth of the pinion would definitely become a weak point.
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