best year for duramax

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best year for duramax

Postby Sir Remington » Mon Jun 10, 2013 7:54 pm

just wanted to pick people's brains about the best year/model of duramax and things like, mpg, reliability, ride comfort, any interior, exterior design features you like or don't like, I've researched for years on this kind of stuff, but want to hear anything and everything you guys have on the subject.
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Re: best year for duramax

Postby OregonSpeck85 » Mon Jun 10, 2013 8:21 pm

My dad had a 2006 GMC 2500 duramax that got about 23 mpg, it never once had a mechanical issue, the only issue we've had is when we didn't let the engine warm up long enough when it was 7 degrees. :no: It had probably the most comfortable seats out of any truck or car for that matter and the ride was very smooth. The one thing I didn't like is the front axle or suspension sat a little lower than the back but we put bigger tires on it and it fixed it.
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Re: best year for duramax

Postby whisperin' duck » Tue Jun 11, 2013 11:43 am

They had a good year?
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Re: best year for duramax

Postby 2500hdon37s » Tue Jun 11, 2013 6:34 pm

best millage will come from the LB7's 01-04 but they haveinjector problems, my pick would be 06-07 classic they dont have the emissions crap. then it would be 08-10 (least years before DEF/ exhaust fluid, but have the particulate filters.) also the newer ones ('05 up, if i remember correctly) have a 6 speed allison trans vs. the older 5-speed allison.

my dad has 315k miles on his 01 duramax and only had the injectors done at 199k before the warranty went out on them, then he finally replaced the ball joints at 300k miles. everything else has been great for him minus the rusting rockers. he gets up to 21mpg on the highway, normally 17-18 in town. there are more duramaxes in my family than all other diesel trucks combined.....
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Re: best year for duramax

Postby gr8white » Tue Jun 11, 2013 8:07 pm

I have an 03 LB7 and other than having the injectors done around 140k (warranty covered) its been absolutely solid. The above post is spot on with LB7 mpg's. I'm also closing ground on the 300k mark and feel the truck has a lot of life left in it. I did think that emissions started with the LLY's and LBZ's though with the LB7's being the only ones without.
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Re: best year for duramax

Postby gr8white » Tue Jun 11, 2013 8:15 pm

Also added a budget tuner (diablo predator) and a ppe boost valve and it really woke the truck up. Can't say I dislike anything about the truck either.
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Re: best year for duramax

Postby 2500hdon37s » Sat Jun 15, 2013 10:00 am

I would look at EFI Live for tunes/ tuning instead of a programmer. better for the transmission and more HP for the $$$
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Re: best year for duramax

Postby gr8white » Sat Jun 15, 2013 12:52 pm

2500hdon37s wrote:I would look at EFI Live for tunes/ tuning instead of a programmer. better for the transmission and more HP for the $$$


$2,500 is a little much for me to be paying for efi live...even if it is top shelf. More hp would require a built tranny/fuel upgrades to realize maximum potential of efi live as far as I'm concerned so that's adding another 5-8k....

LB7's are only good for an extra 90ish hp on a stock tranny so my predator works fine for that...it was only $200.
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Re: best year for duramax

Postby 2500hdon37s » Sun Jun 16, 2013 12:03 pm

gr8white wrote:
2500hdon37s wrote:I would look at EFI Live for tunes/ tuning instead of a programmer. better for the transmission and more HP for the $$$


$2,500 is a little much for me to be paying for efi live...even if it is top shelf. More hp would require a built tranny/fuel upgrades to realize maximum potential of efi live as far as I'm concerned so that's adding another 5-8k....

LB7's are only good for an extra 90ish hp on a stock tranny so my predator works fine for that...it was only $200.

$2500??? thats buying the licensing, all the programming tools etc. its $400 for tunes and a dsp5 switch installed here.

but the nice thing about EFI live is for guys who are built/ keep building, they can fine tune it as you add a bigger turbo, built trans, fueling mods, etc. my brother has all those goodies.
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Re: best year for duramax

Postby NCSUhunter » Mon Jul 15, 2013 8:05 am

Personal opinion is the 06-07 Classic trucks. I may be partial since I own one but I did my research before buying. They pretty much have zero known issues (such as the 6.0 headgasket problem) that are consistent. None of the heavy emissions, 06 was the first year of the 6spd trans and ride extremely well. My truck fully loaded with fuel and 33" tires gets 25mpg hand calculated on the highway with EFI Live. And if anybody has anything to say about towing its had more than 18,000 pounds behind it an never skipped a beat.
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Re: best year for duramax

Postby cONG » Sat Jul 20, 2013 10:42 pm

How fast were you driving on the highway when you got 25mpg? That to good to be true. Is your truck straight pipe? Cold air intake?
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Re: best year for duramax

Postby 2500hdon37s » Sun Jul 21, 2013 10:39 am

cONG wrote:How fast were you driving on the highway when you got 25mpg? That to good to be true. Is your truck straight pipe? Cold air intake?

its realistic. straight pipe, good tunes, air intake, and little larger tires (like 285's) with just a leveling kit doing 65mpg 22-25mpg is plausible given the truck is unloaded and no head wind.

my dad has 4in pipe (louder but still muffler in it), air intake, and very mild tunes with stock 245/75/16 tires and wheels with no trailer he pulls 21mpg on the highway doing 70mph.

and my brother with 750+ HP (bigger turbo, race tunes, fueling mods, bigger pipes every where, etc) on 35in tires with a 4in lift he still pulls 22mpg on the highway and 18mpg in town.
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Re: best year for duramax

Postby gr8white » Sun Jul 21, 2013 11:52 am

I run 285's with a modified air box, canned tunes and a straight pipe. Best I've ever seen is 21 highway. Mixed driving I average 17mpg.
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Re: best year for duramax

Postby NCSUhunter » Sun Jul 21, 2013 8:20 pm

Thats with 305/55-20's. Truck has intake, full 4 inch with downpipe, and egr delete. This was using a EFI Live tune specifically made for fuel mileage. Makes almost 0 pounds of boost when the cruise is set on 65-70.
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Re: best year for duramax

Postby cONG » Mon Jul 22, 2013 7:10 pm

So the lest boost the more mpg. I thought with turbo you need to make 30 pound boost. Like the new twin turbo ford engine
You have 20in tires If you had 16in you would get better mpg
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Re: best year for duramax

Postby whisperin' duck » Mon Jul 22, 2013 10:27 pm

The new f-250 comes stock with 34" tires on a 20" rim. It's more about the weight than it is the diameter I think.
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Re: best year for duramax

Postby 2500hdon37s » Sun Jul 28, 2013 1:39 pm

cONG wrote:So the lest boost the more mpg. I thought with turbo you need to make 30 pound boost. Like the new twin turbo ford engine
You have 20in tires If you had 16in you would get better mpg

uhh what???

boost makes power as you're forcing more air in the cyclinders and that requires more fuel at the same time. so less boost at cruising speeds does net better fuel economy.

20in wheels vs 16in wheels, the bigger the wheel generally the heavier they are, so therefore less fuel millage as you increase tire and wheel weight. takes more to get it turning, I'm running 135lb/ per tire and wheel combo and I'd like to shave 10lbs off each combo for better millage.
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Re: best year for duramax

Postby GMC2500HD » Mon Aug 12, 2013 10:48 pm

03-06 that's what we run at work, and this past winter they took a beating from plowing and sanding but never failed us. LB7 is an amazing Dmax
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Re: best year for duramax

Postby DE-DuckNBass » Mon Aug 12, 2013 11:58 pm

I have a 07 Classic with the LBZ and love it. Alot of people say trucks with them are the best I have done nothing to it but EFI-Live..

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Re: best year for duramax

Postby 2500hdon37s » Sat Aug 17, 2013 12:42 pm

GMC2500HD wrote:03-06 that's what we run at work, and this past winter they took a beating from plowing and sanding but never failed us. LB7 is an amazing Dmax

LB7 is 01-04.5
LLY is 04.5-05
and then 05-07 is LBZ

you have 3 different engines there, not just LB7's
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Re: best year for duramax

Postby waterfowlhunter » Sat Aug 31, 2013 5:54 am

I have talked to the proving grounds guys here several times her in MI. they all agree that the one they would want is the 07. according to them it had the most power, no issues and was not choked with emissions. you could do exhaust upgrades easily and gain more power and they just could not break them in testing. I am looking for a 4 door 07 for my next project truck, going with straight pipe out the back, solid front axle conversion on 38" with minimal lift and fender mods / flares for clearance.

I currently have the 11 duramax and can average (city / highway) 22 as long as I do not play with it, and keep it under 70 on the highway with my summer tires (Michelin LTX A/T2) but with the Wrangler duratracs it drops to 19 and if I run 75 on the highway it drops a bit with both tires. Lots of power and if you turn off the traction control it will ruin a set if tires in a big hurry even in 4wheel drive.

on a trip to Kentucky and back to mi with the cruise set at 68 for hours the average stayed at 26.

2011 hd mpg.jpg


2011 hd speed.jpg
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