5.9L or 6.7L?

Glad I read all this. I think my search for a 2500 CTD will continue until I find the right one.

Unless you use your truck for hauling, like a travel trailer, Fifth wheel, or construction equipment, you will never recoop your investment on a diesel engine upgrade, compared with a gas powered truck. Gas and diesel are pretty close to the same price range today, but 10 plus years back, Diesel was always cheeper, sometimes being half the cost of gas. So that 6 to 10 K upgrade for your diesel engine is a lot of free gas for your gas powered truck. Do not get me wrong, I love my Ram Cummins, It pulls my #10,000 LB fiver, but if I only use a truck for tooling around, I would buy the gas unit.

Originally Posted by MPFIREMAN

Unless you use your truck for hauling, like a travel trailer, Fifth wheel, or construction equipment, you will never recoop your investment on a diesel engine upgrade, compared with a gas powered truck. Gas and diesel are pretty close to the same price range today, but 10 plus years back, Diesel was always cheeper, sometimes being half the cost of gas. So that 6 to 10 K upgrade for your diesel engine is a lot of free gas for your gas powered truck. Do not get me wrong, I love my Ram Cummins, It pulls my #10,000 LB fiver, but if I only use a truck for tooling around, I would buy the gas unit.

You get 3/4's of it back right away on trade. Ever priced a used CTD compared to a Hemi?

^ Agreed... not to mention, what does it matter if I pay $0.10 more per gallon, if Im gonna get several more MPG's for that $0.10?? 19 mpg as opposed to 13 mpg is well worth $0.10/gal if you ask me.

my hemi gets 18-19mpg and gas here is about 30c cheaper than diesel.

I know the new powerstrokes are about a 9k option. Not sure what the cummins is, but if its a 9k option, thats about 180 more a month that you are paying to own that truck.


i liked my diesel but my hemi is very cheap to run

more on the 6.7 to deal with than the EGR. you can't open the exhaust it has sensors in it for the computer. That controls the turbo

Originally Posted by HemiMagnum

my hemi gets 18-19mpg and gas here is about 30c cheaper than diesel.

I know the new powerstrokes are about a 9k option. Not sure what the cummins is, but if its a 9k option, thats about 180 more a month that you are paying to own that truck.


i liked my diesel but my hemi is very cheap to run

Not around town it doesn't... if so you need to share how. I know 2500 CTD's getting 18 in town........ My hemi gets 13, MAYBE 14 if im lucky.

And D-fuel here isnt that much more than mid-grade gas, which is what I run in the hemi. At one point there was only a $0.05 difference.

Yeah but see my HEMI is custom tuned for 93 octane because of all the mods I have. So 30 cent less plus being at stock and having more TQ is a bonus to me.

The DIC tells me I'm getting 18-19MPG around town and 24.5-26 MPG highway in my '06 Cummins. I know everyone says the DIC lies, but the DIC in my 8.1L Suburban says I'm getting 10MPG around town, and our previous Chrysler minivan said 14-15 MPG mixed driving.

Getting back to the subject of 5.9 vs 6.7, I think the 6.7 will eventually work through its' issues and overcome any shortcomings when compared to the 5.9.

It's funny....I'm sitting here trying to think of a personalized license plate for my '06, and I've thought of things like NO EGR, 5PT9, NO SMOG, etc, but I really don't think those statements will stand the test of time. Will probably be a non-issue just like the current musclecars.

I've owned both a Hemi and a 5.9 Cummins. The Cummins is a slug off the line compared to the Hemi but once the Turbo spools up the cummins will set you back in your seat through every gear and leave the Hemi behind.....in a big cloud of smoke....and gets 20 mpg while doing it


p.s. Diesel fuel down the street from the house is $.03 more that REGULAR unleaded and has been that way for months. ( no, it's not red)

I am currently looking for a 5.9 mega but they are hard to find. I have found a few 07 and 08 6.7s with 30-40k on them but was worried about the egr regen issues with as much around town driving that I will be doing. Is it really as simple as unplugging the EGR to help this and do you litterally "unplug" it?? Or should I continue the quest for a 5.9?

I've had both an 05 ram with the 5.9, and the 07.5 that I have now with the 6.7. I put 60,000 on my 6.7 and the only problem I ever had was a bad oxygen sensor, which I bought one off of ebay for 30 bucks. I now have the H&S mini maxx with 5'' ss flo pro exhaust. Now I love the truck even more and I picked up 3 mpg bringing me to what my old 5.9 was getting. I average 17.5 to 18 mpg normal driving and on a trip I've hand calculated 22mpg so thats not bad at all. Hope I've helped someone in making thier tough decision between the two engines.

Originally Posted by Emdog

I am currently looking for a 5.9 mega but they are hard to find. I have found a few 07 and 08 6.7s with 30-40k on them but was worried about the egr regen issues with as much around town driving that I will be doing. Is it really as simple as unplugging the EGR to help this and do you litterally "unplug" it?? Or should I continue the quest for a 5.9?

Yes, unplugging it helps. You will get a CEL that is annoying to see everyday.

It helps a bit with mileage. Not as dramatic as deleting the EGR and DPF, but help nonetheless.

I have had plenty of 5.9 and still have one
I also have my 6.7 and love the hell out of it
I'm glad I got a 6.7 and didn't listen o people that's said get another 5.9
Either wAy you can't go wrong
My choice would be another 6.7

There's a guy with a 6.7 on cumminsforums with over 450,000 miles on his truck. He uses it for hauling heavy loads basically daily. There is a big thread over there about it and he really has had very little problems with it.

Originally Posted by CDP6.7

That's hardly noticeable. What is noticeable is the light year difference in the 68RFE vs 48RE in stock form.

Can I put a new 6spd auto on my 5.9l?

Edit: The answer from my diesel tech was, "Well -- you could bolt it right on, sure, but the software differences would not let it work right." He then went on to suggest several upgrades from ATS that I could do to strengthen the 48RE.

Yeah the 68RFE will bolt right in, but there's no way to control it in a swap scenario. Some have tried the 545RFE PCS Standalone - it's a nightmare.

You could swap an Allison - it'd be easier but you're looking at $10,000-$12,000 installed. There's a reason I yanked my 68RFE and put a 47RE in. These things are awesome when upgraded.

So far nothing's happened at all to make me regret getting the 6.7

We have both a 6.7 truck and 3 5.9 trucks...
They ALL have their good points and bad points and its all in what you want.

I will say in the short time my gal and I have owned the 6.7 truck it is growing on us real quick.