5.9 or 6.7? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 10-09-2009, 01:56 PM Thread Starter
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5.9 or 6.7?

Hi there,
I am looking at Dodge diesels to replace my tired 97 5.4 Expedition. I want a truck so I can upgrade from a travel trailer to a 5th wheel. Since the truck will be used as a tow vehicle and for occasional hauling, which would be better; 5.9 or 6.7? I really don't want to buy another truck in 10 years, if I am still camping then (64). I like the option of the exhaust brake and better trans in the 6.7, but want a vehicle that is dependable and thrifty. Used is my only option, since I cant see having a new vehicle that only gets used occasionally.

Gas is not an option since I will be towing in the mountains on a month long trip out west from Michigan. SWMBO (She Who Must Be Obeyed) wants good mpg around town and I want an easy to drive tow vehicle. That Expedition is real work to drive towing a trailer.

Sorry for the long post.
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post #2 of 13 (permalink) Old 10-09-2009, 05:37 PM
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an '04 Common Rail Truck is what I would be going after then.....

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post #3 of 13 (permalink) Old 10-10-2009, 03:13 PM
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This is tough...if i wanted a hauler in my honest opinion i would have to get another 6.7. plain an simple i love mine now hated it at first. First question though is this truck staying stock???? If so i would have to lean towards a 5.9 now if you were willing to rip emissions off i will say 6.7 cost will be bout even on both to do a free flowing exhaust system so thats no big deal. These new trannys are great from what i hear and read so thats a big plus. I will tell you this much you go find any 5.9 stock from a dealer and test drive it then go find a 6.7 stock and you tell me what you think lol 5.9 stock dont hold a candle to a 6.7 stock hands down IMO! Good Luck Sir on your buy

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post #4 of 13 (permalink) Old 10-11-2009, 02:21 AM
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I would say a 6.7 for towing for the e-brake works well and has a good bower band for low end and top end a small cheap programer superchips will work well will all emisions crap on and get more mpg and power


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post #5 of 13 (permalink) Old 10-11-2009, 04:04 AM
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+ one more for 6.7

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post #6 of 13 (permalink) Old 10-11-2009, 04:36 AM
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6.7 !

I drive a 100% stock 6.7 routinely tow 30-35K-lbs no issue pulls good.

Once I ran it right out to 43K-LBs pulled it like a dream !

The 5.9 is a fine unit but like the 427Chevy or 429ford its eventually going to go exstinct sure it was a brute n parts are around now but 5 10 15 years from it'll be on the list of obsolete n forgotten motors like them GMC Big Block V6s that were all the rage in the mid 50s to early 70s...

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post #7 of 13 (permalink) Old 12-16-2009, 02:25 PM Thread Starter
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Thanx

Thanx for the input on the 5.9 vs the 6.7. What I'm really looking for is longevity and ease of operation. If I tune, it would be to increase mileage and/or towing capacity. Since I have all my mechanical aspirations fulfilled with 30+ year old motorcycles, I'd rather not have to wrench my truck much.

Thanx again.
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post #8 of 13 (permalink) Old 12-16-2009, 02:59 PM
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I say get a 6.7L and rip out emissions B.S.

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post #9 of 13 (permalink) Old 12-16-2009, 04:09 PM
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I have personally owned both trucks and have towed heavy with both. The 6.7 hands down is a better tow rig. Period. The powerband, transmission and e-brake blow the doors off the 5.9. Now I will say this, the 5.9 was quite a bit better but the newer programmers and delete options that are around for the 6.7 will put you in the fuel mileage ball park of a 5.9.

All this being said, go for the 6.7. You'll thank your self!

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post #10 of 13 (permalink) Old 12-16-2009, 04:24 PM
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yea i'm bit on the fence here as well i have towed heavy with both engine they are brute they push pull tow haul anything you can set on them or hitch them too . . .

I went 6.7L on the new truck as well it made good business sense to update and run the new tech then run another older tech unit. . .the 5.9L tho great is only going to get older. . .

Mike

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