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99 gmc truck question

Discussion in 'Truck & Equipment Repair' started by PORTER 05, Oct 11, 2008.

  1. PORTER 05

    PORTER 05 Senior Member
    Messages: 449

    1999 GMC Sierra 3500 Reg Cab 159.5 Dump truck dually 4X4

    Engine: 5.7L 8 Cyl. gas

    Transmission: Automatic

    75,000 miles , with i -pack storage

    hi guys test drove this truck today, the truck from 0 MPH to 10 MPH is very sluggish it had alot of trouble moving, just very slow to get up past 10 seemed like it was being restricted some how , once the truck got over 10 it went fine and it went fast, it was great, when the truck was at 0 MPH and shifted to revers fine, and to drive fine you could hardly tell when you shifted it, was really good, when you where driving from ) to 10 then on and on to 50 you could not tell when the truck shifted it was super smooth....i was told that the 5.7 L has low gears and it was perfectly normal to be sluggish like that, i just got worroied that if it was sluggish like that what would it be if i loaded it with 5 yrds of mucl would it be more sluggish or would it be the exact same way and its just normal, just like if i had bouthg it out of the dealer.

    i wanted to know if this is normal and if guys with this same truck see this same thing..

    thank you

    plan on buyig the truck , they want 14,900 for it it also has a 8.5 fisher mm plow, the truck looks brand new its nice....i was going to give him 11,500 sash and see what he says.
  2. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    Maybe just in the way it is geared?? It should have 4.10's and the 4L80E trans. I had the same set up in a 94 2500 and it had all kinds of go go juice down low like that. Did it sputter or anything on take-off?? Seems odd, im sure B&B will have more insight to this:drinkup:
  3. PORTER 05

    PORTER 05 Senior Member
    Messages: 449

    nope, it shifted great into D from N and when i put my foot on the gas and pushed it down to pull out of the lot it seemed as though i was towing somthing or had a full load in the truck but i dint, i though that the E break was was but it wasnt...then after about it reached about 10 mph it started to go faster down the rd and i was going 50 in no time it was great, i couldnt even tell when the truck was shifting , i was nice, but then i pulled into a lot stopped and then took off again and even going slow around the lot it seemes sluggish like somthing was blocking or somthing..