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3.73 vs 4.10?

Discussion in 'Chevy Trucks' started by Kollerman, Feb 9, 2010.

  1. Kollerman

    Kollerman Senior Member
    Messages: 113

    Hey Guys,

    I found a 2005 GMC 2500HD at a local dealership. It has the 6.0L engine with about 41,000 miles on it and the thing is mint! Very clean and the previous owner took excellent care of it. It has a 8.2 Boss V on it as well. The previous owner put it on to do a small apartment complex that he lives in so that he could get a break on rent.

    Here is my question. The dealership said the truck has the 4.10 rear end in it. I am wondering how much difference in gas mileage there is between the 4.10 and 3.73 rear ends? I know you that everyone is probably going to say that if you are worried about gas mileage, don't buy a 3/4 ton. But this would also be my daily driver and I drive about 40 miles round trip each day, so gas mileage is kinda important to me. I would like to get a 3/4 ton not just for plowing, but also because I also have a 25ft camper that I pull around pretty much all summer long. My family and I go to different parts of the state camping and I think the 3/4 ton would handle the camper much better and last longer.

    I currently have a 2000 GMC 1500 and I don't mind the gas mileage at all. I get about 18-19 on the highway and about 14-15 in the city. If I would go after this truck, am I going to see a drastic decrease or not?

  2. mkwl

    mkwl 2000 Club Member
    Messages: 2,362

    That truck will have the 4.10's for sure- GREAT for power and torque- not good for fuel mileage. I see around 8-9MPG around town, 10 if I'm lucky, and around 12.5-13 Highway.

    Best of luck with the purchase!
  3. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    Yea, you'll see a drastic decrease... I had an 03 with the 6.0 and 4:10's... Lets just say you drive to work 40 miles round trip... figure about 11-12 mpg if your going easy... The tank holds 26 gallons.... Just driving to work and not going ANYWHERE else, you'll be filling the tank every week and a half.... You'll be putting roughly $70 a fillup.... If you can swing it... do it.. I loved that truck but wanted the diesel. That's why I sold it.
  4. Novadiecast

    Novadiecast Senior Member
    Messages: 194

    My 07 Classic CCSB with a Boss V gets 11.5 with no plow, about 9.5 with plow on, and 4.5 plowing as per the computer.
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If you're plowing during the winter and towing all summer long you want the 4.10's with the 6.0 regardless.
  6. papa

    papa Junior Member
    Messages: 10

    I have a 2001 2500 with the 6.0 and 3.73's.

    on the highway empty I get about 15.

    around town 11-12

    pulling my 7x14' box trailer loaded about 8-10
  7. Chrisxl64

    Chrisxl64 Senior Member
    from CT
    Messages: 574

    if its a matter of 1-2 miles per gallon difference and you intend to work the truck,,,go with the 4.10's your better off. If youre getting killed on gas as it is,,,mind as well get top performance out of it,,,even if it costs you 1 or 2 mpg.
  8. Yeah, what he said!!!:nod::nod:
  9. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    I have a 2000 2500 6.0, 4.10 extended cab. I get about 12 city, 13 or so highway. You'll find it launches alot more easily and you can get a hevay load moving with alot less work witht eh 4.10's. The kicker is you pay for it with highway economy. If they put a 5sp auto in them, this would be moot.

    I agree with B&B though, it sounds like you use your truck as a truck really frequently and you'll be alot better off in the long run with the taller gears.
  10. Scott13136

    Scott13136 Member
    Messages: 53

    I can not speak for the 6L but, we have 2 6.6L with 3.73 and 1 with 4.10 and I get the same mileage with all 3. The other 2 drivers get better milage than I do. Can we say driving style?
  11. JustinD

    JustinD Senior Member
    Messages: 343

    A Duramax with 4:10's? I wasn't aware that option was available???
  12. Scott13136

    Scott13136 Member
    Messages: 53

    it is an 03 3500 CCdually
  13. JustinD

    JustinD Senior Member
    Messages: 343

    Pretty certain all Duramax equipped pick up trucks got 3:73's only ones that got 4:10's were the 4500 and 5500 trucks.
  14. 1500hdcntryboy

    1500hdcntryboy Junior Member
    Messages: 7

    1500HD's have an option for the 4.10's and the 2500HD gassers and diesels come standard with the 4.10's
  15. Scott13136

    Scott13136 Member
    Messages: 53

    I cannot "prove" that the 03 has 4:10s in it. I went over last night to see if there was any documentation on it, and there was none. I will see if I can locate the window sticker from the origional purchase, it might still be on record some place.

    If it does not have 4:10 then that woudl explain my getting the same milage on both. I did how ever confirm that when the truck was purchased he was told that it had 4:10 because it had the trailer package and it was the largest p/u available without going to the 4500.
  16. 1500hdcntryboy

    1500hdcntryboy Junior Member
    Messages: 7

    look for the rpo code in your glove box, GT4 is the 3.73 gear and GT5 is 4.10, G80 means you have the locking differential
  17. Scott13136

    Scott13136 Member
    Messages: 53

    all three have 3.73s thank you for the information.
  18. ontario026

    ontario026 Senior Member
    Messages: 228

    must be nice, my 2000 6.0 ECSB 3.73 unloaded, I think the absolute best I have ever gotten was about 11.7MPG and normally average about 8.1-9.5 mpg....

    Plowing is normally about 4-5mpg
  19. SawHoss

    SawHoss Member
    Messages: 89

    My 2000 2500 (non HD) has the 6.0 with 3.73 gears, on the highway, ive seen as high as 17 (not going over 70 though) Usually, cruising at 75, i can just barely squeak out 16.5. In the city, im around 11-12 no matter what my driving style is. With my 2006 Duramax, cruising at 75, i can get 22 all day. Its a night and day difference. Also, while plowing, my duramax will get almost twice the mileage compared to my 6.0.
  20. ontario026

    ontario026 Senior Member
    Messages: 228

    Sawhoss, your truck sounds almost identical to mine, 2000 2500 non hd 6.0 3.73, but yours seems to smoke mine milage wise... I wonder why the big difference?
    absolute best I have ever gotten was just shy of 300 miles to the tank (26gallons I think) especially in the winter my normal average is probably about 240 miles to the tank...