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  1. #1

    Default new to GMC can anyone help?

    i just got a 1990 gmc stepside 4x4 with a 5.7 a 4' lift and 33's on it and when i drive it feels realy slugish... its got a magnaflow cat back... take off is really slow.. can anyone help?

  2. #2

    Default

    Quote Originally Posted by k_lakey View Post
    i just got a 1990 gmc stepside 4x4 with a 5.7 a 4' lift and 33's on it and when i drive it feels realy slugish... its got a magnaflow cat back... take off is really slow.. can anyone help?

    Welcome to the site.

    Do you know what gears you have in it? It sounds like you may not have enough gearing for the size tires you are running.

    You might also check the timing, if it is off it could cause sluggishness.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  3. #3
    Legend bry2500's Avatar
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    Default

    I would agree about the timing, 33's are not significantly over sized so IMO they are less of a factor here. Still if the gearing has been changed from stock before then they become more of an issue.
    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  4. #4

    Default

    Welcome to the site. You didn't mention, but considering the age of the truck you might want to check out the catalitic converters. They can cause a lot of issues when they go bad. Just a thought.


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  5. #5

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    Quote Originally Posted by GaryL View Post
    Welcome to the site.

    Do you know what gears you have in it? It sounds like you may not have enough gearing for the size tires you are running.

    You might also check the timing, if it is off it could cause sluggishness.
    BTW ... Nice looking Sub. Are those 285 75's? Any rub issues? Any lift?
    02 Chevy Suburban 1500, 4:10 Difs, Stock for now.

    02, CC, LB, 4x4, LB7, 145K Miles, EFI Live Tuned by Nick at Duramaxtuner, Banks Ram-Air w/ superscoop (Plate Removed), Banks Big Head, AirDog 100, Pillar Gauges, 16x8 Eagle wheels, 285 BFGs, Bilstein 5100's, Ride Rite Air Bags 5" Exhaust, 4" downpipe, Prodigy Brake Controller, Goose Neck.

    02 Grand Prix GT.

  6. #6

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    Quote Originally Posted by trailshredder View Post
    BTW ... Nice looking Sub. Are those 285 75's? Any rub issues? Any lift?

    Thanks. Yes, 285/75/16's and a 3 inch suspension lift. I put the tires on before the lift and did not have any rubbing at all.

  7. #7

    Default

    im going to get a tune-up kit as soon as i can get more money and i did the injector cleaner last night. trans fluid is good. and i went and got a RPM TACH for it so i need to hook that up.. A.S.A.P. just trying to look for the right way to do that... lol oh p.s. thanks so much for all the help
    BEAST

  8. #8

    Default

    Make sure to have it scanned for codes. There may be a code stored in memory that can point to the power loss.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  9. #9

    Default

    i dont know what gears are in it... i think stock

  10. #10

    Default

    and the catalitic converters looks new

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