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Open Roads Forum  >  Towing

 > GM 6.6 & 3:73

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jffnkrn

peoria

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Posted: 06/19/22 09:33am Link  |  Quote  |  Print  |  Notify Moderator

Looking for actual input, experience not opinions without experience.
Anyone that has a GM, 6.6 gas with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff

* This post was edited 06/19/22 05:59pm by jffnkrn *

Michelle.S

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Posted: 06/19/22 10:02am Link  |  Quote  |  Print  |  Notify Moderator

Before I can answer, are your talking 6.6 Gas or 6.6 Duramax Diesel????????
Will make a huge difference in the answers you get.


2018 Chevy 3500HD High Country Crew Cab DRW, D/A, 2016 Redwood 39MB, Dual AC, Fireplace, Sleep #Bed, Auto Sat Dish, Stack Washer/Dryer, Auto Level Sys, Disk Brakes, Onan Gen, 17.5" "H" tires, MORryde Pin & IS, Comfort Ride, Dual Awnings, Full Body Paint

routeforty

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Posted: 06/19/22 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

My 05 duramax ,3:73,towing a 28’ TT about 6000lbs, mostly from Ohio to eastern shore of Maryland via Interstate 68 averaged about 12mpg. But I don’t get in any hurry going anywhere(speed limit or less)


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jffnkrn

peoria

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Posted: 06/19/22 06:00pm Link  |  Quote  |  Print  |  Notify Moderator

Michelle.S wrote:

Before I can answer, are your talking 6.6 Gas or 6.6 Duramax Diesel????????
Will make a huge difference in the answers you get.


sorry, I just updated my post, Gas.

Michelle.S

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Posted: 06/20/22 07:48am Link  |  Quote  |  Print  |  Notify Moderator

Then sorry can't help. Last gasser I had was a 1987 Silverado 1500 with the 350/5.7 On my third Duramax 2005, 2011, and current 2018 pulling three different Fifth Wheels, but very close to the same mileage with all combinations.

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Posted: 06/20/22 08:58am Link  |  Quote  |  Print  |  Notify Moderator

OP, you might want to add some info on what you plan to tow. I towed an 8-9000lb TT with a GM 8.1 gasser back ~15yrs ago. It pulled well (except up steep grades in Rockies) and never passed a gas station without stopping. Pulled 14-17k 5ers the last 10yrs with diesels…no comparison.


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Posted: 06/20/22 09:47am Link  |  Quote  |  Print  |  Notify Moderator

They're slightly better than a 6.0/6 speed/4.10 truck.
The lose some of the new power to the taller gear ratio and obviously the trans isn't adding anything to the equation.

Milquetoast offering for a "new" high dollar HD truck. Both the Godzilla 10 speed and Hemi 8 speed out pull it.


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jffnkrn

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Posted: 06/20/22 02:23pm Link  |  Quote  |  Print  |  Notify Moderator

Towing a fifth wheel, GVWR at 14K. I am just looking at comparisons on what others had from gas to gas, more specifically the change form the 6.0 to the 6.6, gas yes, 4:10 or 3:73, Preferably the 3:73. Just getting some real life info. not opinions. thanks

Dadoffourgirls

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Posted: 06/24/22 12:41pm Link  |  Quote  |  Print  |  Notify Moderator

I had a 2020 6.6 gas reg cab dually. I towed 15k lbs (gooseneck with round hay bales) many times. It was in Michigan. No issues, and had experienced some uphills from a stop.


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rhagfo

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Posted: 06/24/22 01:25pm Link  |  Quote  |  Print  |  Notify Moderator

jffnkrn wrote:

Looking for actual input, experience not opinions without experience.
Anyone that has a GM, 6.6 gas with 373 gears, towing I would like to know your experience with towing power, fuel mileage and overall performance.
Again, looking for actual information and maybe a comparison to what you had before. thanks in advance. Jeff


Sorry no experience, just opinion.
Towing 14K with a gas 3500 SRW, you will have plenty of payload, and I assume Peoria it the one in Illinois, as long as you stay in the plains states pulling should not be an issue.
If you travel to either coast that 6.6 may need to rev a bit in the hills, but it will get you there.


Russ & Paula the Beagle Belle.
2016 Ram Laramie 3500 Aisin DRW 4X4 Long bed.
2005 Copper Canyon 293 FWSLS, 32' GVWR 12,360#

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