Lantley wrote: Why are you trying to combine ratings. The axle has a rating and the tires also have a rating. Your logic is flawed.
I'm not trying to combine ratings, I understand they are different.
I wrote that in my opinion the weight of the tires, wheels, drums, axle, differential should not be included in the scale weight when determining the RAWR because those items don't put a load on the axle... on the other hand the wheels and tires do carry all of the scale weight when measured with the rear tires on the scale.
Sure, you can modify the rear end of your light truck all you want and make it one bad ass truck. But all that work and expense will not change the certification ratings. Just don't get caught.
Lantley wrote: Why are you trying to combine ratings. The axle has a rating and the tires also have a rating. Your logic is flawed.
I'm not trying to combine ratings, I understand they are different.
I wrote that in my opinion the weight of the tires, wheels, drums, axle, differential should not be included in the scale weight when determining the RAWR because those items don't put a load on the axle... on the other hand the wheels and tires do carry all of the scale weight when measured with the rear tires on the scale.
Yes but don't you think the engineers considered those factors when they rated the axle for your truck. Why do you feel it is necessary to recalculate it for them? AT what point do you think axle specific components come into play? Are the wheel ratings the only factor to consider when rating the axle? Using your logic you can increase the wheel ratings and the axle rating automatically increases. Nothing else to consider?
07'Duramax dually,12'Open Range 399BHS
Hawkshead TPMS,Hensley BD3,Killerbee exhaust brake
Blue Ox Bedsaver,air bags w/compressor
Arvika pin box bike rack,Bak Flip tonneau cover
5500 Onan LP,EMS-HW-50
14'Porta Bote w/8.0 Nissan
Vu Cube 2000,Splendide 2000S
flysar wrote: Rear tire weight with truck unloaded 3035lbs.
Loaded TC and got a weight of 7540lbs; incl water & propane.
My 03'F350 CC rear axle is rated for 6830.
I would think the actual axle load would be the 7540lbs minus rear tires, wheels, axle, differential, etc since the axle is not carrying that weight... tires are but not the roll around assembly.
Is that crazy thinking? I'm no engineer so don't laugh at me to hard, but there is a real good chance I may be within my axle rating and just need to upgrade wheels & tires to 19.5's or I'll be going to a dually.
If that seems reasonable what do you think the rear rolling assembly weighs?
If you can afford to get a dually and don't need the dually to park in a certain garage or space go for it. Otherwise you can join half of the TC folks and upgrade your tires and wheels. Some of the 17'', 18'' might work or the 19.5 rims would work. Then you just choice a higher rated E rated tire but you might be getting a bigger tire then you want....
2011 Dodge Ram 3500 4*4 Black dually Laramie 4.10 gears
2011 Arctic Fox 1150 Drybath
2009 Polaris RZR w/fun parts
2011 Polaris Sportsman 550 XP EPS w/stuff
2006 Polaris Sportsman 500 w/stuff
1977 K5 Blazer 1 ton modified
2007 Toyota Camry Hybrid (her car)
My SRW Dodge had a rear axle rating that was limited by the stock tires and wheels. The axle itself is rated by AAM at 10,410#. When I replaced the stock tires with Rickson wheels and load range "G" tires I raised the carrying capacity to over 7000# and I don't worry about the axle carrying that weight.
Frank
2011 Palomino Maverick 1000SLLB on a 2004 Dodge Quadcab CTD Ram3500 SRW long bed equipped with Timbren springs, Stable Load bump stops, Rickson 19.5" wheels/"G" range tires and a Helwig "Big Wig" rear anti sway bar.
So you need tires and wheels that are rated at least to 3800 pounds each. Your wheels may already be rated at that. Worth a look see. I believe that they are marked. If the wheels are rates at 3800 pounds; then all you need to do is find some proper tires for the rear.
Kurt
2001 Silverado 3500 DRW CC LB 6.0
1993 Lance Squire Lite 150 (8'6")
2001 Fleetwood Caribou 11J (11'6")
The weight of the axle/tires/wheels/springs is included in the GAWR. That is the way it is. Quit fighting it. That is standard practice all over the auto and truck industry, has been for many decades and will be for many more to come. Accept it and move on.
SoCalDesertRider wrote: The weight of the axle/tires/wheels/springs is included in the GAWR. That is the way it is. Quit fighting it. That is standard practice all over the auto and truck industry, has been for many decades and will be for many more to come. Accept it and move on.
What he said!!
Personally, I respect the axle and tire ratings and do not exceed them willingly. GVWR and GCWR are another matter and I personally believe there is some MINOR wiggle room there with well thought out mods.
flysar wrote: I wrote that in my opinion the weight of the tires, wheels, drums, axle, differential should not be included in the scale weight when determining the RAWR because those items don't put a load on the axle... on the other hand the wheels and tires do carry all of the scale weight when measured with the rear tires on the scale.
That's not how it's rated, though.
You don't know how much the tires weigh.
You don't know how much the drums weigh.
You don't know how much the axle weighs.
You don't know how much the differential weighs.
It would be impractical to pull those items off the truck and weigh them, or weigh the loaded truck without them. It is also beyond the mental capacity of the typical consumer to deal with such abstract ideas.
Manufacturer's rear axle weight rating is a simplification. Whatever the scale under the tires reads counts against the GRAWR.
2002 Chevy 3500 DRW 8.1L/Allison
2000 Palomino B1500
...and the reason why I need a DRW to haul a Palomino:
2004 United 7x14 tandem axle enclosed toy trailer
2011 PJ 8x20 7-ton deckover equipment trailer
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