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Old 08-04-2015, 05:46 AM   #15
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My truck with 68RFE transmission and 4.10 gearing is a 4X4. I am at 135XX miles now and I am getting roughly 16 mpg on trips of about 10 miles to from work. When I take it longer distances I will get about 18 maybe 19 mpg. This is a DRW truck and the rolling resistance of the extra 2 tires drops 2 to 2.5 mpg off what a 4 wheeler would get. On the 2015 tables above my exact same truck has a GCVWR of 30,300 lbs. change to an Aisin automatic and the number jumps to 37,800 lbs. that also adds about 3K to the truck price.
The stability of the DRW truck is totally different from the SRW. The dual tires plant themselves on the road and it does not get pushed in the wind as bad as a SRW truck does.

I have towed across the suspension bridge in Charleston SC with no troubles, while I saw the SRW trucks getting blown out of their lanes!
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Old 08-04-2015, 08:53 AM   #16
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Read the specs and see. There are two ratings one for trailers and one for fifth wheels.
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Old 08-04-2015, 02:10 PM   #17
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Quote:
Originally Posted by Kevinc2011 View Post
.
The stability of the DRW truck is totally different from the SRW. The dual tires plant themselves on the road and it does not get pushed in the wind as bad as a SRW truck does.
That is an opinion do you have scientific facts to back this up!

Before I retired from the heavy equipment industry as an engineer. I use to receive SAE on highway and off highway magazines along with WARD'S Auto WORLD. In the magazine the trucking industry was looking at using just one tire on each axle side instead of the two wheels presently used. Why better fuel mileage with weight carrying ability and improved stability for the trailers. This was achieved with stiffer and more ply's in the tire side walls with a larger foot print. Test are under way and some time in the near future if fuel cost go up again to off set the cost of fuel the trucking industry may switch.

Here is the article and I guess the time is now.

New X-One tire lightens the load - Truck News

Jim

P.S. I am using a Nitto Dural Grappler LT285/70R 17-126R 10ply tires on my 2008 Ram Mega Cab SRW for increase stability and load carrying ability.
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Old 08-04-2015, 05:25 PM   #18
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That is an opinion do you have scientific facts to back this up!

Before I retired from the heavy equipment industry as an engineer. I use to receive SAE on highway and off highway magazines along with WARD'S Auto WORLD. In the magazine the trucking industry was looking at using just one tire on each axle side instead of the two wheels presently used. Why better fuel mileage with weight carrying ability and improved stability for the trailers. This was achieved with stiffer and more ply's in the tire side walls with a larger foot print. Test are under way and some time in the near future if fuel cost go up again to off set the cost of fuel the trucking industry may switch.

Here is the article and I guess the time is now.

New X-One tire lightens the load - Truck News

Jim

P.S. I am using a Nitto Dural Grappler LT285/70R 17-126R 10ply tires on my 2008 Ram Mega Cab SRW for increase stability and load carrying ability.
There talking about Super Single tires aren't they? Those are Semi Truck 22 " tires, and one of them is equal to both of my tires on my dually per side.
Believe me when I say for a light duty truck like a Ram 3500 , the dually is super stable compared to any Srw. I've had both, and the Dually Rocks. Last week 45 mph wind gusts on the side, and never went over either painted line, one handed. Try that with a srw. Not trying to be a smart
A $$, just the facts. Scientific no, but real world towing experience.
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Old 08-04-2015, 07:49 PM   #19
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Read the specs and see. There are two ratings one for trailers and one for fifth wheels.
My specs on my truck were from the manufacturers sticker and the manufacturers sticker in my door jam, not just from some book!
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Old 08-05-2015, 06:41 AM   #20
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4:10's gets the worse fuel economy driving solo. But evens out when towing as the engine is not working as hard.

For towing 4:10 is the best gear Ram has for towing.

For best solo driving fuel economy the lower the number the better. From worse to better for example. 4:10, 3:93, 3:73, 3:52.
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Old 08-05-2015, 03:39 PM   #21
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Scientific proof that a DRW will be more stable than a SRW truck...ugh. Can't even respond to this.
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Old 08-05-2015, 06:36 PM   #22
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There talking about Super Single tires aren't they? Those are Semi Truck 22 " tires, and one of them is equal to both of my tires on my dually per side.
Believe me when I say for a light duty truck like a Ram 3500 , the dually is super stable compared to any Srw. I've had both, and the Dually Rocks. Last week 45 mph wind gusts on the side, and never went over either painted line, one handed. Try that with a srw. Not trying to be a smart
A $$, just the facts. Scientific no, but real world towing experience.
No; what I was trying to point out is that the tire side wall rating and number of ply's in a tire is what will make a vehicle more stabile. Most end users are familiar with the P tire and the 8 ply LT tire that most tow vehicles come with; including your DRW truck. The reason a DRW truck is more stabile is the addition of the extra side wall of the two additional tires and foot print.

On my truck I am using a 10 PLY tire that has a load rating of 3,750 LBS each which provides a load carrying ability of 7,500 LBS total for the rear axle. The additional ply rating makes for a stiffer side wall and less tire squirm when under a heavy load that is placed on the tire along with the wider foot print. An a better ride when unloaded since the SRW rear tire is air down to 50 PSI.

Everything else between my 2008, 2500 Ram and a 2008, 3500 SRW/DRW truck are identical same disc brakes, axles, engine cooling package, transmission, engine and frame. The only difference is the extra single leaf spring per side on the 3500 SRW and the GVWR.

Jim W.
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Old 08-05-2015, 08:47 PM   #23
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^^^^^^, so your saying because your running those particular tires on a 2500 Ram srw, it's as stable as a 3500 dually? I'm just trying to see your train of thought here.
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Old 08-06-2015, 09:46 AM   #24
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Nice to know what your getting on mileage.

You mention about lowering the air pressure for a better ride when empty. I've though about adding air suspension such as the ones from Kelderman. That way you get the softer ride when empty and the truck stays level no matter what the load. Ram has a air ride but it's not as good as the Kelderman but it's also not near as expensive. With the Kellerman you can have air both front and back if you wish.
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Old 08-06-2015, 01:45 PM   #25
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Nice to know what your getting on mileage.



You mention about lowering the air pressure for a better ride when empty. I've though about adding air suspension such as the ones from Kelderman. That way you get the softer ride when empty and the truck stays level no matter what the load. Ram has a air ride but it's not as good as the Kelderman but it's also not near as expensive. With the Kellerman you can have air both front and back if you wish.

I thought about the Ram air ride, but it was incredibly difficult to find any trucks sitting on a lot that already had it. When I finally did I couldn't tell the difference in ride quality with the air vs without and decided we didn't need it. So I just have the $300 kit, and it's just fine.

And speaking of mileage, after about a week with my tires at the higher pressure I'm averaging about 15.1 in town, according to the EVIC. Spine is still intact as well, so I'm just gonna leave it like it is.
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Old 08-06-2015, 07:25 PM   #26
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Nice to know what your getting on mileage.

You mention about lowering the air pressure for a better ride when empty. I've though about adding air suspension such as the ones from Kelderman. That way you get the softer ride when empty and the truck stays level no matter what the load. Ram has a air ride but it's not as good as the Kelderman but it's also not near as expensive. With the Kellerman you can have air both front and back if you wish.
I know nothing about the Kelderman buT I do know the rear air ride on the RAM works very well! Here is a pic with 9,500# sitting on the rear tires. Also it rides very nice!

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Old 08-06-2015, 08:32 PM   #27
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I know nothing about the Kelderman buT I do know the rear air ride on the RAM works very well! Here is a pic with 9,500# sitting on the rear tires. Also it rides very nice!

I saw that the 3500 had an air ride option and I think they now have an auto level but not a dump. Is that correct?
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Old 08-07-2015, 06:43 AM   #28
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I saw that the 3500 had an air ride option and I think they now have an auto level but not a dump. Is that correct?
Yes they have auto level. It's in "alt trailer" mode in pic. I leave it there even solo. I like it to sit near level. In normal mode it rides about 1" or so higher.

No Dump.
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