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  1. #1

    Default 1999 chevy suburban 5.7 vortec ~need performance advice

    Hey guys , I'm new and love the great amount of info . OK as for my truck , I am building a project , so I ordered the 6 inch lift and the 35 12.50 tires as well as the black xd rock star 20 inch wheels. I need your guys help here please . So I'm new to the 4 x 4 scene and I am new to the fuel injected builds with all the different vortec engines . I see all the different things that are being done whether internal basic bolt ons ... superchargers and my favorite turbos . I built 9 Sec cars and engines from when I was 15 till now so I Amy pretty knowledgeable. So on to the mods .... I have basic bolt ons ...
    Already installed
    Magnaflow high flow cats
    Magnaflow series 40 2 in 1 out stainless
    All stainless exhaust 3.5 inch single
    Yes single but it does sound great . He ran it higher for the 6 inch lift .
    Royal purple diff
    Royal purple power steering
    Royal purple oil with filter

    it's cold so I haven't installed the items below
    msd vortec cap n rotor
    msd coil
    msd 8.8 plug wires
    Plugs ???? I need
    ok so future

  2. #2

    Default

    Swap the diff gears to 4.56s. The stock 3.42 or 3.73 will have the motor lugging all the time.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  3. #3
    Master Mechanic BurbanMan's Avatar
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    Default

    Quote Originally Posted by Boonduff View Post
    Swap the diff gears to 4.56s. The stock 3.42 or 3.73 will have the motor lugging all the time.
    would 4.10 gears not do ok?
    Chuckie!!!


  4. #4

    Default

    If you already have the 4.10s in it, go with, but if you're gonna swap I'd go with 4.56s. A suburban is a heavy vehicle and needs all the mechanical advantage the deeper gears will give it.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

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