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Old 01-05-2013, 12:02 PM   #11
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Quote:
Originally Posted by Oaklevel View Post
I have no door sticker on my truck so I usually run within 5 PSI as to the tires rating when towing.
Perhaps it is in the glove box or truck manual...
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Old 01-05-2013, 12:16 PM   #12
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Thanks,
No I've looked none of the doors or frames, glovebox, & being I bought it used the manual was gone. The good its an 05 with 53K (When I bought summer 2011 it now 63K). It has some custom paint work.
The tires that were on it my tire guy had a fit & couldn't believe they worked. P rated & bigger than stock. Its a duelly. Now I replaced all six as they were worn out anyway.
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Old 01-05-2013, 12:21 PM   #13
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Dave,

I found this and it might help as a poster has the same truck as you (except SRW) with his door post sticker intact.

3500 SRW Tire Pressures - Dodge Diesel - Diesel Truck Resource Forums

Another thread

http://www.rv.net/forum/index.cfm/fu...print/true.cfm
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Old 01-05-2013, 12:34 PM   #14
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Thanks,
Apparently the was a tire inflation guide (& the door sticker) that were origionally with the truck. I have neither. Gives me a place to look further. Going back to that site....
Thanks again, Dave

I've been doing alot of assuming with this truck but you know what that gets ya......
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Old 01-05-2013, 07:01 PM   #15
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Mine call for cold inflation @ 80psi

When towing, I run 65psi front & 78psi rear

When non-towing, I run 58psi front & 62psi rear...smooth ride, for a 2500 ):/
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Old 01-06-2013, 07:34 AM   #16
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Quote:
Originally Posted by herk7769 View Post
So, here is the thing:

Using my GMC Sierra 2500HD with Duramax diesel engine SRW as an example.

Door post sticker:
LT 245/75R/16 tires (MAXIMUM PRESSURE 80 PSI Cold Inflation Pressure)
front - 60 PSI (supporting a load of 2480 pounds per tire) 4,960 pound axle
rear - 80 PSI (supporting a load of 3042 pounds per tire) 6,084 pound axle

However,
The maximum GVWR is 9300 pounds; not 11,044 pounds.

My actual weight (NOT TOWING)
Front Axle - 4160 (or 2080 pounds per tire)
Rear Axle - 3600 pounds (or 1800 pounds per tire)

To support the actual load according to the attached Michelin recommended tire pressure (truck not towing) the front should be 50PSI and the rear should be 40 PSI.

If pressures are at door sticker 60/80 the truck is a beast on rough roads, skidding and bouncing to the point control can be lost easily on washboard roads (especially on a down hill slope).

I typically run 55/65 when not towing as that gives me a reasonable ride and handling, though I still get a pretty good bounce out of the rear.

When towing my 5th wheel camper, ACTUAL AXLE weight:
Front: 4180 pounds (or 2090 pounds each tire)
Rear: 5100 pounds (or 2550 pounds each tire)

Using the chart, 55 PSI still works for the front (I run the recommended 60 PSI anyway) and the rear at 65 (Michelin recommended) but I run at 70 PSI which provides me with a safety margin yet limits "chucking" and bouncing that I see at 80 PSI.

As you can see, 60/80 is "safe" for the maximum GVWR of my truck (9300 pounds - including the maximum axle loads front and rear). A different pressure set up works much better for me since I know exactly the load on each of my tires towing and empty.

You of course can run anything you please, but you asked why I don't use the pillar pressures and this is my logic.

Thanks Herk,

That is what I way trying to get across in my post was why people do different things. My old Dodge had a light load setting on the TPMS and you could run 45psi in the rears as long as you only had 2 passengers and no cargo in the truck. Always thought that was hokey till I read that Toyo pdf that states LT tires need more air to carry the same load as a P metric. The Super Duty rides so much better with the Michelins that I just leave them at 65psi all the time.
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Old 01-06-2013, 11:33 AM   #17
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Just an opinion...........
Alot of it is what one is comfortable with (within reason), as there are numerous combinations of trucks & trailers. The previous owner of my truck (05 Dodge 3500 duelly) took several of the leave springs out including the helpers & went with air bags.....assuming to make the ride better. The fiver rails were in the bed. I was not at all comfortable with that with my trailer (35 ft with a pin weight just under 3000lbs) & found a donor truck & put the springs back along with heavier rated tires. Personnally I don't notice that much difference in ride but I do not drive it daily. I know some would notice the difference. I had been running near the tire manufactures air pressures. But again I don't drive it daily & often have one of my trailers hooked to it.
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