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Old 04-27-2008, 04:34 PM   #1
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2002 thru 2006 GM 2500s

OK, the old truck is getting up there in miles, and I hopefully won't have to replace her yet, but....

It never hurts to start looking.

Just wondering what peoples' experiences are with the GM 3/4 tons with the 6.0L gas motor. I drive few enough miles that I would never be able to justify the expense of diesel fuel (and the extra cost to purchase a diesel truck), and the 8.1L is just too much motor for my needs (gasp- did I just say that?). Don't need a one-ton, only really ever tow the Sunline.

Any thoughts on fuel mileage (or lack thereof)? I drive like a complete wuss- since I drive for a living, I'm not in too much of a hurry to get anywhere in my own truck- I always leave plenty of time- so think of me as the speed bump in the slow lane when thinking MPG

Maintenance issues/ repair stuff? My '98 has been great- 163K+ miles with VERY minimal repairs.

Thanks for any and all input!

Greg
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Old 04-27-2008, 07:28 PM   #2
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Re: 2002 thru 2006 GM 2500s

Quote:
Originally Posted by Mooney
OK, the old truck is getting up there in miles, and I hopefully won't have to replace her yet, but....

It never hurts to start looking.

Just wondering what peoples' experiences are with the GM 3/4 tons with the 6.0L gas motor. I drive few enough miles that I would never be able to justify the expense of diesel fuel (and the extra cost to purchase a diesel truck), and the 8.1L is just too much motor for my needs (gasp- did I just say that?). Don't need a one-ton, only really ever tow the Sunline.

Any thoughts on fuel mileage (or lack thereof)? I drive like a complete wuss- since I drive for a living, I'm not in too much of a hurry to get anywhere in my own truck- I always leave plenty of time- so think of me as the speed bump in the slow lane when thinking MPG

Maintenance issues/ repair stuff? My '98 has been great- 163K+ miles with VERY minimal repairs.

Thanks for any and all input!

Greg
Greg,

I have a 2006 GMC Sierra 2500 4x4, 6.0L with 4.10s. I've only pulled the 2363 once (home from where I bought it), a one way trip of about 45 miles. It just so happens that I bought it 5 minutes from where I work, so I'm fairly used to how much gas I use on that exact trip. With the trailer, the usage was up, but not by a whole lot.

For hard MPG numbers, I calculated my MPG in that truck pulling my car on a trailer (~4500 lbs car & trailer) and got 14 MPG on a 240 mile round trip. That was all highway, cruising along at the speed limit of 65.

Since the 2363 is heavier and has a bit more wind resistance, I'm guesstimating 10-12 when pulling that. We'll see for sure once I have it road worthy.

The 6.0 does good on the highway, but tooling around local sucks down the fuel big time. I've had no issues with the truck, but I only have a few thousand miles on it - I kept my 2000 Blazer for a daily driver. My dad has an '02 2500 with the 6.0 since new, no issues with that truck, however there was a little top end noise on cold starts. Upon complaining to the dealer, they dismissed as "normal" (which I have since confirmed with a few friends that wrench full time on GMs - it's a common occurance). Anyway, expressing that he was displeased with that noise got the powertrain warranty bumped to 100,000 miles no charge. He's gotta have 50 or 60k on it now.

Limited info I know, hopefully it helps some.

- Frank
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Old 04-27-2008, 08:47 PM   #3
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I have an 07 classic with 6.0L and 4.10 rear end. I have not paid close attention to mpg, but it is around 11 when towing. I have less than 5k miles as I only drive the truck when pulling my sunny. I thought long and hard when purchasing a new TV to replace my 10 year old Dodge. It was down to a nice F150 or the the 2500HD work truck. I went with the 2500HD and have not regretted it. It pulls my 2553 nicely. If I were using it as a daily driver, I might have gone with the Ford, but I really like pulling with the truck I have.

I have read truck sales are way down. You should be able to get a good deal on a new truck if you are interested, but even used truck values are down. Check out http://www.businessweek.com/lifestyl...tm?chan=search or go to www.businessweek.com and search on truck sales.

I wish I had waited one year to purchase, but I am not sure I like the new body styles yet either.

Good Luck!
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Old 04-27-2008, 10:45 PM   #4
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I had the 6.0 with the 4.10 rear end in my 2003 Suburban.

On my 6800# loaded T2499, the truck did well. No strain or pain. I only tow at 60MPH and drop it in 3rd. It worked great.

Mileage. Around town empty, 13 highway 15

Towing, ranges from 7 to best ever was 10 MPG. Mist times was 8.5 to 9.5 but in the last year I had it would not get much above 8. Something in the gas changed I believe.

At about 50K miles I have what I belie is piston slap. She knock like a stuck valve lifter until it warm up then no issues. While noise, it never affected performance other then me getting ticked at it. I have a buddy with a 2500HD with one it it and he has the piston slap too.

The engine pulled well. No problems on the T2499. However on the Burb I did have issues coming home from PA the TT empty on the T310SR. I did not run out of engine, I ran out of tranny cooling. That higher TT and wind drag really is a pulling factor when you hit the back hills in PA.

Note, on the 4.10 rear end, nurse it until she shifts or else. You stomp on it and she will kick up her heals and go. And so will the gas gage right to empty. If you have a 3.73 it will take some learning to nurse the 4.10. It just wants to get up and go when not towing.

I would buy another one without hesitation.

Good luck

John
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Old 04-29-2008, 07:19 AM   #5
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I think 9 to about 11 MPG is about average for most gas engines when towing. My Dodge V10 get s 9.5 at 55mph, My Ford V6 get 10.5

It seems only the diesels do better but the maintance costs ,fuel and purchase price is higher. The gas engine just seems to be the best bang for the buck. I know alot of guys really crying about the diesel prices. The gas prices arent too special either.
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Old 04-29-2008, 02:40 PM   #6
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But once you go over to the dark side, you'll never want to tow with gas again.
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Old 04-30-2008, 06:58 PM   #7
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Thanks for all the info gang!

I knew I would get good stuff here. It actually looks like my mileage and such would stay the same around town, and go UP while towing- I thought it would, but you all confirmed it- that with more motor, and a full-on HD setup (vs my 3/4 ton rear springs, and oil and tranny coolers that were added....)

"T310SR. I did not run out of engine, I ran out of tranny cooling. That higher TT and wind drag really is a pulling factor when you hit the back hills in PA."

The PA hills are why we're going to Ohio this September via Cooperstown and the NY thruway- once we get out of the Berkshires in Western MA, it's flatter thru NY than PA- the hills are pretty intimidating just getting out of MA with my little 305; but I'll make it (taking our sweet time because of the little motor (that should)) work- barring sudden death by repair bill between now and then. I r-e-a-l-l-y want a 2500 though

After the axle-flip, I did notice quite a bit more wind drag (5" higher than the photo below now- I posted before and after photos in the mods section a while back), but was lucky enough to have a family who likes to ask what is desired for holidays.... and got a wind deflector for Christmas.

I used it for a short trip down the highway a couple weekends back, and, while it looks a bit (very) goofy, the wind resistance is way, way, way down. I will post in this forum when I get better numbers. I like that the one I got collapses when not in use (around town during camping) or comes off EASILY (4 clips) when done.

As for diesel: "But once you go over to the dark side, you'll never want to tow with gas again."

believe me, I know- I drive big rigs for a living...BUT I like my job, and it would be too easy to develop a daily fuel leak....directly into a jug for me

Actually, with the little driving I actually do for myself, the diesel would never pay for itself- the coach is ONLY a 2380- not THAT big!
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Old 05-01-2008, 03:46 AM   #8
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Mooney

What kind of wind deflector to you have. I have always wondered if they work and with gas prices where they are it may be a option for many of us.
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Old 05-01-2008, 07:28 PM   #9
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A good friend of mine just bought a 2004 3500 HD (single rears) with the 8.1 and the 5 speed Allison tranny with 3:73 gears. He's getting a consistant 12.8 mpg tooling around town. He was going to buy a 2500 HD with the 6.0 but you can only get the 4:10 rears in the 6.0. In his research he found that the 6.0 with the 4:10 rears and the Chevy automatic gets virtually the same mpg as the 8.1 with the 3:73 gears and the allison. Another buddy of mine has a 1996 3500 Chevy customized dually (37,000 miles on it) with the Vortec 454, and 4:10 gears. He gets a whopping 9 mpg constantly, towing or not. I guess it pays to do some research before you buy a truck.
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Old 05-01-2008, 07:30 PM   #10
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I got the "Fiber-Lite deflector" from JC Whitney, in the 17"x60" size, adjustable, with the mounting bracket kit (could be made from sheet metal, but I don't have the proper tools or time- the $14 for the brackets was cheap enough.

I would suspect minimal advantage, if any, on a vehicle without a cap or solid rear area (Suburban, Expedition, Tahoe, etc.)- as when setting it up, the deflector had to be REALLY close to the back of the cap, and adjusted to an angle to shoot the air (water to set adjustment) up to the top of the coach, about 4" down from the top...

when I get more time, I'll post photos and numbers (need to do somewhat more accurate tests than "seat of the pants feel".
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Old 05-05-2008, 07:27 PM   #11
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Mooney


OK, got the deal after the LOF- and Old Blue will be leaving the building!

Just too old.

SO, following the advice of ya'll,

WEDNESDAY, I'll be picking up my new-to-us 2004 Silverado 2500HD extended cab 4x4.

6.0 gas
Tow Package
Snowplow prep (never been plowed though)
an honest-to-goodness LEVER ACTUATED transfer case (I always hated the magic button for 4wd on the '9
Cap on back
GM Certified (decent warranty for free on a used vehicle?? SURE!)

4:10 gears w/ rear locker...and so on....

Can't wait 'til Friday when we are going camping for the first time with her.
Nothing like trial be fire, huh?

THANKS FOR THE HELP! Photos posted ASAP!

(can you tell I'm excited?)
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Old 05-06-2008, 06:14 PM   #12
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Old 05-06-2008, 08:02 PM   #13
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Thanks my technologically inclined little bruddah! I'm still going to put up some of my own later- I guess the sig. line will need an update, so I'd better go camping as planned this weekend!
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Old 05-06-2008, 09:08 PM   #14
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Greg

Congrats on your new ride. She is a good truck and will serve you well.

Happy Towing.

John

PS If you need help in setting up the WD on that torsion bar 3/4 ton front end, let me know. Glad to give you some pointers on what to look out for.
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