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2001 2500hd 8.1 liter

Discussion in 'Chevy Trucks' started by Scenic Lawnscape, Nov 28, 2008.

  1. Scenic Lawnscape

    Scenic Lawnscape Senior Member
    Messages: 481

    what are the pros and cons of this truck? 4x4 crew cab
  2. erkoehler

    erkoehler PlowSite Veteran
    Messages: 3,252

    Just picked up the same truck except I got the 6.0L gas engine. Hopefully I'll be able to put it to work in the next week!
  3. Rc2505

    Rc2505 PlowSite.com Addict
    Messages: 1,245

    I know one of the cons. At least with my 1999 2500 crew cab. It takes about 40 acres to turn the damn thing around. A standard 3 point turn in most trucks = a 6 point turn in my truck. Add the plow, and the spreader on the back and it's almost 25 feet long.
  4. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    i heard from rumor that they tend to use a bit of oil in between oil changes....
  5. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,719

    Find B&B, he's got a beast of his own and will tell you anything you'd like to know.

    Pros- allison 1000 trans, aam 11.5 rear axle, hauls major tail

    Cons- Thirsty
  6. mercer_me

    mercer_me PlowSite Fanatic
    Messages: 6,358

    A freind of mine has one with the 8.1 and it gets horible gas milage, alot worse than the 6.0.
  7. Onebadbowtie86

    Onebadbowtie86 Senior Member
    Messages: 106

    I didnt know gas mileage could get any worse then the 6.0? my 2003 2500hd with the 6.0 and 4.10's averaged around 10-12, what does a 8.1 get?
  8. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,719

    I think around town 9-10 and hwy- 11-14. I've heard a pcm tune, full exhaust (headers all the way back) will really help them out.
  9. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Mark pretty much has it covered.

    Since the one in question is a first year truck the main things you want to check is if its had all the TSB updates done on it for the drivetrain. This includes the revised intake bolts (lessens oil consumption), the drain back valve in the front pump of the Allison (prevents the delayed engagement issues), as well as the newer design NSBU (neutral safety back up lamp switch).

    You'll enjoy the pulling power that no 5.7, 6.0, or 7.4 will match with approx the same MPG that the old Vortec 7.4's have. They have as close to the same pulling characteristics of a diesel that you can get.....without actually having to buy a diesel. :nod:

    As for actual MPG, after a few years of very close monitoring mine averages 8.3 - 9.1 MPG around town (loaded or empty). And 11.1 - 11.6 on the highway (loaded or empty). And anywhere from 55 - 85 MPH..cruise on or off makes no difference.
  10. exmark1

    exmark1 PlowSite.com Addict
    Messages: 1,320

    I had a 2001 8.1 with 60 K on it I was going through a quart of oil every 500-700 miles and GM said it was NORMAL! WTF... I got 13 mpg at best averaged around 9 mpg but the power was amazing for a gas engine.
  11. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Did you have the updated intake bolts installed? That cures a fair amount of the oil consumption.

    But anyone who knows the big block Chevy's of any era knows they use some oil...the 8.1's are no different.
  12. exmark1

    exmark1 PlowSite.com Addict
    Messages: 1,320

    I honestly don't know...I bought the truck used and only put about 10k on it before I got rid of it.
  13. alivings

    alivings Junior Member
    Messages: 18

    I have an 02 GMC 2500HD with the 8.1 and I love plowing with this truck, Boss 8' superduty. I use Shell Rotela T synthetic and it burns about one quart every 3000 miles. I get an average of 13 mpg, it all depends on how you drive. This truck will pull anything you put behind it. I have a flowmaster cat-back and computer programmer, about $800 for both upgrades.
  14. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    A hand held programmer, or a custom tune? Big difference between the two. :nod:
  15. alivings

    alivings Junior Member
    Messages: 18

    I have a hyperpac. I installed it in August so I am still messing around with it so far it's helped out with the gas mileage.