5.9 or 6.7 Cummins
 

I am about to purchase a one ton to work out of and can't decide to get a newer 6.7 or try to find a low mileage 5.9. I know the 5.9 is proven and gets better fuel mileage. Guy we hunt with has a 5.9 and I rode with him to the camp a few weeks ago the truck got 25mpg with the cruise on 70. What can I expect to get with a 6.7? How much does removing the DPF help with mpg on the 6.7? Any info would be helpful.

5.9 all the way. I have had 3 6.7 dident like any of them!!! got a 4wd dully with a 6 speed and only get 16 to 16.5 on a good days. theres a guy in Bryan Tx. putting in new 5.9's in place of the 6.7 thanking about haveing it done.

My buddy has a 6.7 dually automatic with grip tires cruising at about 60 he gets about 21-23 (deletes with edge). Dad has a 6.7 standard and going about 75 on the interstate with 35s he gets 19 or so without deletes. My brother has a 6.7 with 35s also with an automatic and gets over 20 mpg cruising on interstate and has gotten 25 mpg before (deletes with smarty). Either way you go ought to be good.

Well I have had a 07 with 6.7 the truck got 18mpg with a automatic an 410 gears. I deleted the egr and emission on it at 220000 miles. That was my only complaint with the truck besides the poor fuel mpg when pulling. I sold the truck with 300000 miles and its now got 400000 on it. I now have a 11 5500 with 87000 miles on it with no problems at all.

Buy you a 5.9 in a 05-06 if possible, I had an 06 3/4ton and it was a great truck but in 07 they changed to new 6.7 and have heard a lot of bad trouble with it.... that's just my opinion and what I heard

The 6.7 has fuel system issues and turbo issues. I dont care what anyone tells you, there is not a truck on the road with stock tires or big tires programmer or no programmer delete or no delete that is gonna get over 20mpg! If it does then they must have put 20k under the hood...and where is the savings in that?! the 6.7 shoud get around 17 or 18 on highway and the 5.9 will get 22 at 60 to 65 mph. go to 70 and itll get down to 20 or below.

So you saying I'm lying? What makes you the expert?

I witnesses first hand a 5.9 2500 4x4 crew cab long wheel base getting 25mpg with the cruise set on 70. Stock size tires and a edge programmer. I hear alot more issues with the 6.7. I found a 5.9 with 70k miles but it is in houston. Gunna keep looking or I may drive to houston it is super clean. Thanks for the info

I have never had fuel system issues on my two 6.7s and all of the turbo issues that I have heard about were the direct result of the clean burn exhaust system malfunctioning. I can tell you this my dad has had both the 5.9 and the 6.7 and the 5.9 gets better mpg but doesn't have near the power of the 6.7 stock. Now when he put an H&S tuner on the 5.9 it helped it some but it still won't run with the stock 6.7.

I won't agree or disagree about the fuel mileage numbers but I know for a fact that putting mine on 65mph cruise control it would SHOW 25+ but when I would calculate mileage and gallons it was about 20mpg and running 75mph to west Texas it would show 22-23mpg but calculate to about 18-19mpg.... this was over several trips and several yrs on a completely stock 5.9 3/4 ton 4x4

Also on the fuel mileage debate going on never trust the lying mpg on the truck because I can guarantee you are getting from 1-5 mpg less than its showing you and I have proven this fact to many people by simply calculating mpg the old school way.

Anybody got a programmer for a 5.9 I can use? I want to see if I can improve my mpg. I got a 6 speed dually and I'm lucky to get 16. Maybe I just have a low geared rear end. It will pull a loaded 24 ft trailer full of 400lbs calves and accelerate up a hill with out straining though

The mpg shown on the dash is ALWAYS off! I even read a news article on it a few months back. They are on average, from any given manufacturer, off by 5 - 18%.

This!!
 

Yea, This is my truck 6.7 Mega cab 4x4 w/ 6spd on 35" toyo's.. Staight highway, it'll calculate 19-20. Have got 22 calculated on a trip to dallas on 33s. Not overhead.. 10-12 pulling 35' camper running 75 also.. Bone stock. Oh yea, I have a fairly heavy foot..
Delete it and u'll have more power and just as good mileage as the 5.9. And there's more low mileage 6.7s out there than 5.9s.

Do u have one?? Or did u read that too??:rolleyes:

The one in my 09 f150 always shows about 2 or 3 mpg better than when i calculate it myself as did my f350 and all of my friends and families vehicles.

My bad man I wasnt trying to offend anyone. But I have had a diesel and have many friends with them and a few of my friends are diesel mechanics so I am speaking from my own experience.

I just got rid of my 6.7. I loved the truck but the fuel mileage sucked. It really sucked towing. 11MPG It was bone stock. I had the 5,9 before and it was awesome on fuel. Cummins are awesome. I dont think its a 5.9 versus a 6.7 thing. I think it is the newer 6.7 has all that pollution crap on it. Finding a low mileage 5.9 may be tough.

I've got the 5.9 2006 4wd quad cab & have put all 175k on it. Still runs just like the day I bought it. I'll get 21-22 sometimes 23 on interstate 60-65 hit 70 & it starts dropping fast. It'll tell me I'm get 25 mpg but caluculations tell me 22 or so. I have a LARGE AFE Filter, no cat & 5" magnaflow exhaust from turbo back & a programmer. Each of these items jumped my mpg by 2-3 mpg. Ticket with a diesel is to let it breathe! What air is going in must go out! Sitting in my truck at idle I can hear the air going thru the intake.;)
The 5.9 is a stud. I know there was a few bugs with the 6.7 on the polution crap. But don't think it was anything major

I personally own a 2012 ram 2500 4x4. I love it. Way more power than the 5.9. I get 16-17mpg.hwy and 14.5 around town. My truck is bone stock. My brother has an 07 ram 2500 4x4 deleted with 33's he gets 21mpg average. My uncle had a 2012 ram 3500 4x4 and the front end broke 3 times on him. This is something I hear has been a problem on all the new 6.7 3500's. don't take my word for it though, look it up. Personally I love my 2500 but I wouldn't buy the 3500. IMHO.

I may just go the 6.7 route and do all the deletes. Im not worried about warranty cause it will be a commercial truck anyway. Like said it is hard to find a 5.9 under 100,00 miles. I know can last a long time but I rather be the one to put the miles on it vs someone else.

Id go check out the one in Houston. But if you dont mind the $1, 000 for deletes, the 6.7 would ve a good choice

Called them today it's gone.

If its commercial and be rolled, the deletes will pay for themselves in fuels alone. Top that off with the reduced risk of meltdown and it's a win win.

I was thinking the same thing

I have 05 5.9 2500 4x4 with about 140,000 on it now! When the truck was bone stock the first year I drove it, it did 17-19 hwy, and 14-16 city. Never any better, and only worse when towing or added weight in the back! A 600lb wheeler, or a 1,000lb trailer load would drop it 15-17 and 13-15 mpg! Before I purchased this truck every diesel owner I knew said that added tow, or weight did not effect mpg, but that was not he case, but still not bad for a 325hp 610 foot pounds of torque 8,000 lb truck! After all were not driving a Prius here.
After 15,000 miles I added 35in tires a leveling kit with 2 in block in the back and super chips flashpaque tuner, for a Lil more ooommff! Set up like this the truck does 14-18 hwy 12-14 city the higher mileage naturally is empty truck with less fuel, and the lower would be with a load on the truck! Since the day I bought the truck the computer lied about the mileage, along with my close friends 05 5.9 and my uncles 06 5.9. Mine stock said 21-22 mpg hwy, and 17-19cty my calculations did not add up to this ever! With the programmer it said 23-25 hwy 19-21cty, again the computers lying! I've always calculated my mileage as long as I can remember, and then out of curiosity on fishing and boating trips doing the same on my buddy's and uncles. Then again their's was also not accurate! I've been in 6 different 5.9's 4x4's from 04-06 models and none of them did better than 20 hwy, but all respectfully close to my mileage some being stock, 2 being 6 speed manuals 4.11 gears! The 6 speed manuals did the closeest to 20 hwy empty! The 4 speed autos a Lil less with 3.73 rear ends. Either way you look at it, if you do buy a 5.9 your getting a great motor in a decent truck! 2 of the trucks I'm very familiar with are pushing 400,000 original miles on the motors! Tranny for those years are another story! That Lil motor is tranny destroyn machine! It pulls like a freegin freight train!

Yeah the computer lies for sure....I saw my hunting podnas truck it was saying 28-30mpg. I said no friggin way a 4x4 crew cab long wheel base could do that. When we stopped to fill up back in lafayette it got 24 and some change. Still damn good....now half of the trip the speed limit is 65 so I am sure that had alot to do with it. Like you said the autos don't hold up for extended times....I will not buy anything but the 6 spd manual.

Love my 6 speed....but peddle to the floor is 82mph..... it runs out of rpms. Definatly needs another gear or two.

Oh and with the manual, you will NOT have a fast truck. The autos are WAY faster

Not worried about speed truck will be pulling a 40' gooseneck

Montauk, shoot me a PM if I can help locate a truck for you. We buy trucks all over the country.

Thanks will do

I pull a 40'gn everyday and in my opinion instead of a 3500 series buy a 4500 or 5500 for the bigger tires and breaks. Also if you haven't bought a trailer yet make sure your trailer has electric over hydraulic brakes.

I agree with you just don't want to put up that much money on a truck just starting out. I will be pulling my uncles trailer and it is electric brakes.

I had electric on mine and you can't keep them working so I spent 2000 bucks and had electric over hydraulic put on and I haven't had any problems since. If you need to know any questions feel free to ask me and I will be happy to answer them.

Thanks I appreciate it

Just saw the older post about new trucks with 5.9 conversion.......damn! That would be awesome!!!

Saw the "Pinks" episode the other night with the Bully Dog crew racing as S-10 with a strojed 350.....rollin coal baby!!!

The auto tranny on your previous truck held up to heavy towing on a regular basis?

EXACTLY. Put the pencil to it and it always changes .

Oh And 5.9 all the way.

Mine did 95k my buddy's did 60 k
Spoke with 2 top notch tranny specialist, and both said I was blessed to get what I did with the programmer and bigger tires! The tuner curves the power range substantially in second gear, wear it makes a lot of its torque! 2nd gear is notorious for going out on the 4 speed.
Both said they've seen numerous 4 speeds with 60-70k miles slipping second from non aggressive drivers meaning your typical 70 yr old man pulling his airstream 6 times a year!
The trick is heavy duty clutch plates, and and oversize torque converter! Heat kills them!
I pull an occasional 10-12k load, but pull 3,500-4000 3-4 times a week 6 moths a year! I've got a Jasper in mine now with the heavy duty plates and over sized converter! 4,500 installed! My buddy has a custom built that ran 7k
A dodge factory will run 3,700 @ dodge cost before Jethro Bodine installs it!
The manuals burn plates also, but are not quite as costly to repair or replace!

Yes it's got 400000 miles on it now. I had the 6speed Asian in it and I never had any problems with it. I have pulled 30000 with it.

New dodge 6.7 have nothing on the 5.9. They have a good engine but ****ty *** everything else

Go with a ford instead.
They will haul more
More reliable
Trans wont fall out
They will haul ***
Ac is bullet proof
Straight axel
Will pull the trans and front end out of a chevy
Will pull the body apart on a dodge.

Not buying a ford

I have a 2005 5.9 stock crew cab 4x4 I get 20 mpg most of the time some times better . But it's the roughest truck I have ever owned any on have any ways to make it ride better love the truck but always feel like I need a new kidney after a long trip wished I would have got the mega cab too

The front end in a dodge is the second worse other than chevy. Ford has the best with the dana 60 and 2 huge free axel connections. Over all ford is the best on the market weather you like it or not.
Buy a ford to hang with the big boys

My good friend works at hub city ford....they break just as much as the dodge or chevy. I'm not worried much about repairs I can do my own work. This was not a discussion about dodge chevy or ford simply about two different cummins engines.

You find more Dodge 3/4 and 1tons being used for hot shot then Ford or Chevy

My uncle has put over 500,000 on two different 1 ton dodges without any out of the ordinary repairs. These had the 5.9 engine and 6 spd manual.

Guy I know has a uncle that hot shots with a 98-99 Dodge 1ton with over 1million miles.... they call it the ghost.... said truck looks rough but runs great

New 6.7 is trash. They look fantastic! But I dont like to stand on the side of the road next to a pretty truck.......all the electronic crap they put in that powerstroke did it in.....bring back the 7.3 and you might have an argument........