RAM 5500 Questions - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 10-15-2009, 07:24 PM Thread Starter
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RAM 5500 Questions

Might be upgrading to a 5500 in a couple of months or whenever our current truck gives out on us... I've noticed that these trucks have less horsepower and torque than the 3500s, why is that? I would have thought to get this truck to have more power to tow bigger loads. I guess the 4.10, 4.56, and 4.88 gears that I think I've seen would make up for at least some of the power loss, but wont these gears make it do a lot worse fuel mileage when empty?

'06 4x4 2500 QCSB 5.9 - 155,000 miles

'11 4x4 3500 MC DRW 6.7 - 55,000 miles
'08 4x4 2500 MC SRW 6.7 - 115,000 miles
'09 4x4 3500 CC DRW 6.6 - 118,000 miles

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post #2 of 5 (permalink) Old 10-15-2009, 09:45 PM
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The reason these trucks are de-rated in a heaver application is because they are going to be operated in "harsher" conditions ie. pulling heavier loads. That being said they pull power from them for durability and longevity. This is why you have tow files and race files on most programmers. Because you increase cylinder pressures as you increase the load on the truck. Couple that with increasing pressure by adding power you start to compromise things such as your head gaskets.
Now with all that said, you hit the nail on the head. Typically you won’t notice the decreased power the the change in gear ratios. Again you were right in that you will notice a loss in MPG.

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post #3 of 5 (permalink) Old 10-15-2009, 09:48 PM Thread Starter
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That's what I was thinking, our 3500s engine has held up plenty good already though with loads bigger than what the 5500 is rated for.

'06 4x4 2500 QCSB 5.9 - 155,000 miles

'11 4x4 3500 MC DRW 6.7 - 55,000 miles
'08 4x4 2500 MC SRW 6.7 - 115,000 miles
'09 4x4 3500 CC DRW 6.6 - 118,000 miles

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post #4 of 5 (permalink) Old 10-17-2009, 01:20 AM
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Ya but you get you a CC 5500 4x4 and you will never be happier you can even get boxes put on them i saw a 4500 wit a custom box WOW was all i could say to my buddys dad who it belonged to...

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post #5 of 5 (permalink) Old 10-17-2009, 02:22 AM
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when we first got the 5500 4x4 it got 12mpg, it dose 75mph and tows 30-35k routinely it has scaled as heavy as 43K and handled it fine. . .

2008 Sterling 5500 4x4 same as ram5500 6.7-CTD 6spd auto 4.56's 225/70R19.5's. . .heck the 19.5's are worth the up grade.

factory power setting for the 6.7 is 375hp n 735tq. dodge n sterling detune them to the 305hp n 610tq and 350hp n 650tq settings.

Now if you pitch a FIT you can get the dealer to turn it right back up to the 375 n 735 tune Cummins designed the motor for. . .

I did ! they did now i get 15mpg. . .


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Last edited by M123KT-450; 10-17-2009 at 02:24 AM.
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