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GVWR - What does it really mean?


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#21 OFFLINE   farmer

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Posted 07 April 2013 - 07:30 PM

GVW. Gross Vehicle Weight

GAWR. Gross axle weight rating


The combined axle rating of both front and rear axles often exceed the recommended GVWR of the manufacturer of vehicle.

The general consensus is at least try not to exceed the gross axle weight rating.

#22 OFFLINE   Rusty Bridges

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Posted 07 April 2013 - 08:37 PM

Were the troppers pulling over vehicles with plates from states other than Alabama and writing citations?  I’m no lawyer, but that doesn’t sound like something they can enforce on vehicles licensed in some other state.  Here is what I found on RV Safety.com:

 

No, no matter what state you are in, if you have the propper plates for your state you are good in that state.

 

I was merely illustrating how my state changed the law and started immediatly enforcing it against IT'S citizens.

 



#23 OFFLINE   Rusty Bridges

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Posted 07 April 2013 - 08:43 PM

GVW. Gross Vehicle Weight

GAWR. Gross axle weight rating


The combined axle rating of both front and rear axles often exceed the recommended GVWR of the manufacturer of vehicle.

The general consensus is at least try not to exceed the gross axle weight rating.

Gross Vehicle Weight Rating is based on more factors than Axle capacity. Brake capacity, even Gear Ratios affect GVWR. ie a truck with 4.10 gears will have a higher GVWR than one with 3.73. It is not just how much you can support, but how much you can move and how much you can stop.



#24 OFFLINE   KnightEagle

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Posted 08 April 2013 - 08:59 AM

hey rusty gear ratios don't really play into gvwr all that much. it is more for fuel ecom and how well it pulls. I cant say for certain if all test their trucks the same way. Yet ford test theirs out in Arizona I belive now on their proving grounds. Back in the 90's-70s They tested them also in D'hanis Tex. There we ran them max loaded for 50kmilles or more to simulated 20 years of whare. Belive me should see one of those trucks they look like a swayback horse. a one ton carring 6000lbs pulling a trailer weighing 14000lbs running over 6" pot holes hitting every wheel at 20" spaces for 300' at 45mph or another test running over parking curbs and broken concret at 35 mph for 1/2 mile.  another test powerhop hill with those curbs again on a 35 degree hill at full throttle from a standing stop to the top. The river course a 5 mile run through gravel 36" deep rocks from dime size to mellon size. Then speed test up to 90mph loaded and unloaded. There we pushed them till they failed. I know first hand. Tell you don't want to be in the drivers seat when an axle fails from being overloaded and doing hwy speeds.


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#25 OFFLINE   dubob

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Posted 08 April 2013 - 10:27 AM

That was some very stressful testing.  I'm curious; do you recall what percentage of the test vehicles made it to the 50k miles mark without failure?


:usa:
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#26 OFFLINE   dubob

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Posted 08 April 2013 - 02:50 PM

Okay, I’ve got a handle on the wheels (rims) and tires now.  My rims are GM OEM 17X6.5J rims rated at 3000 lbs each and will hold 80 psi of air pressure.  My tires are aftermarket LT235/80R17 E with a load index of 117 (2833 lbs)/120 (3085 lbs) and a speed index of R (106 mph max).  The tire inflation tables indicate that these tires will handle a load at 80 psi air pressure equal to 3085 lbs (single) or 2835 (dual).  So I have a 6000 lb weight capacity (wheel/rim limited) on the front axle based just on the wheels and tires.  The GAWR for my front axle is 4860 lbs so I have to wonder what the weight rating is for just the front axle.  Anybody have an idea where I could find that information other than trying to get it from GM?

 

Looking at the rear end where most of the TC weight is going to be I find that I have an 11,340 lb weight capacity (tire limited this time) on the rear axle based just on the wheels and tires.  The GAWR for my rear axle is 8200 lbs so I have to wonder what the weight rating is for just the rear axle this time.

 

I don’t have any actual weights on the truck yet but I’m headed over to my local farm supply store tomorrow to weigh the truck without the camper and with me and my bride plus a full tank of diesel fuel.  The COG dry weight of my 992 as it left the factory is supposedly 3310 lbs.  The doorjamb sticker on my truck says the payload capacity of the truck when it left the factory was 3786 lbs.  I’m going to go out on a limb here and guess that my Lance when loaded on the truck and filled with food, water, and gear is going to exceed that 3786 lb payload figure.  Any takers on that bet?  Just the 45 gallons of fresh water is going to be over 360 lbs.

 

Granted, a little of the overall weight is going to be riding on the front axle, but I’ll be a little surprised if I’m not just a little over the GAWR for the rear axle based on the factory sticker.

 

So how about it guys and gals; anybody know what the front and rear axle weight limits are for a 2008 Chevy Silverado 3500HD, DRW, diesel truck?


:usa:
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I’m 76 years young and going as hard as I can for as long as I can.
“Free men don't ask permission to bear arms.” ― Glen Aldrich
“Be who you are and say what you feel, because those who mind don't matter,
and those who matter don’t mind.” ― Dr. Seuss

2010 Chevy Silverado 2500HD, SRW, 6.0L gas/2011 Lance 992


#27 OFFLINE   Fennemore

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Posted 08 April 2013 - 03:08 PM

Welcome to the club of being over at least one of the manufactures designated capacities but still under your tire/axle actual capacities.


-Matt Fennemore -
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#28 OFFLINE   gsair

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Posted 08 April 2013 - 06:51 PM

How do you know the oem rims are 3000 lbs capacity?



#29 OFFLINE   Bedlam

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Posted 08 April 2013 - 08:18 PM

Many times on the inside offset of the rim, you will find the size and weight rating stamped on it. When it is not there, you have to research who sourced the rim to the OEM or what other makes/models use that product under what loads to see if you can extrapolate a rating. Example: If I found that same rim on a larger DRW truck with a 14,000 lb RAWR, I would know the rims are rated for better than 3500 lbs each.


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#30 OFFLINE   gsair

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Posted 08 April 2013 - 08:51 PM

read post #9, as this is as close as I could get to the rear axel rating. 

http://www.cumminsfo...le-ratings.html



#31 OFFLINE   Bedlam

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Posted 08 April 2013 - 09:05 PM

So how about it guys and gals; anybody know what the front and rear axle weight limits are for a 2008 Chevy Silverado 3500HD, DRW, diesel truck?

Your truck uses an AAM 9.5" on the front and AAM 11.5" with a minimum 4800 lb front and 8550 lb rear rating by GM. This limitation may be wheels or suspension.

 

http://pickupwiki.co...evrolet/3500DRW

 

You may be able glean some information from here: http://www.gmupfitte...er_manuals.html

 

The AAM 9.5 is also called a Saginaw 9.5 and rated at 6000 lbs: http://en.wikipedia....w_9.5-inch_axle

 

The AAM 11.5 is rated up to 13,500 lbs when it was used in the 2001 GM HD with many applications claiming 10,000 lb ratings: http://en.wikipedia....lt_Differential


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#32 OFFLINE   wirenut

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Posted 09 April 2013 - 04:09 AM

dubob,

Accoridng to AAM your rear 11.5 axle is rated for 10,912 pounds. I have a pdf that shows lots of other info but I don't know how to post it. I found it by searching the AAM website.



#33 OFFLINE   dubob

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Posted 09 April 2013 - 05:19 AM

How do you know the oem rims are 3000 lbs capacity?

I found the information on a website that sells OEM wheels and the weight/air pressure figures were both posted there.  And since the original tires that came with the truck (LT225/75R17 E) mesh with that specification, I beleive it is correct.


:usa:
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#34 OFFLINE   gsair

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Posted 09 April 2013 - 05:30 AM

I have a 2006 chevy drw with stock wheels. 6.5 x16, they are stamped on the inside with "accuride". Look on page 27 of this link, I see some wheels there that look like they may be yours. this does not answer your questions, but it still nice to know your limits of components.

http://www.accuridew...Summer-2011.pdf



#35 OFFLINE   dubob

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Posted 09 April 2013 - 09:17 AM

Further research based on the helpful tips provided from NATCOA Members, I’ve gleaned some further data concerning my truck suspension components.  It would appear that my front axle is an AAM 9.5” and the rear axle is an AAM 11.5”.  Some published data on these axles indicate that the GAWR for the 9.5” is 6,000 lbs and for the 11.5” is 10,000 lbs.  These two figures would now appear to be the limiting factors for both the front and rear WR’s.

 

I’ve also found the GCWR for my truck and that figure is 23,500 lbs so I’m not going to have any problems with pulling my 2,500 lb boat, motor, and trailer package with the camper on the truck.

 

I guess the only thing I need to determine now is what the weight limit is for my springs on both the front and rear of the truck.  Anybody got any ideas on where to find that information?


:usa:
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“Free men don't ask permission to bear arms.” ― Glen Aldrich
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and those who matter don’t mind.” ― Dr. Seuss

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#36 OFFLINE   Bedlam

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Posted 09 April 2013 - 09:32 AM

You should assume they are at the published Chevy axle ratings I posted earlier. If you can find the GM part numbers for the springs, you can try to cross reference the parts to heavier rigs to see if they can handle more on their own. These can be supplemented with additional metal or air springs once you get some real world weights when loaded.


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#37 OFFLINE   blackmaxx

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Posted 09 April 2013 - 11:24 AM

Bob

I can't argue with any of your logic. I know I'm over, I have airbags and better tires but I am still looking at getting a new 1 ton. Only thing keeping me from pulling the trigger is all of the pollution stuff - it appears to be causing a lot of grief for many folks. I'm biding my time to see how the technology progresses.

#38 OFFLINE   gsair

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Posted 09 April 2013 - 01:25 PM

I always learn something from these post. My truck is a 2006 drw which has a front axle weight rating by gm as 4800 and rear axle rating of 8200. my wheels are rated at 2440 I believe. That is where I thought the wheels were the weak link in the front.Now I think I was wrong.  Dubob's 2008 drw, and correct me if i am wrong, has a front axle weight rating of 4860 and a rawr of 8200 by gm. His wheels are 17 inch and my wheels are 16 inch. His wheels are rated at 2800 if I am right, and his fawr was only increased by 60 lbs. I got the 4860 of the internet, so I may be wrong here. That tells me there is another factor for the ratings on the chevy front end, like maybe brakes. The chevy front end has an ifs, where as ford and dodge have a front axle similar to the rear. For me, I am going to stick with my rule as, 4800 front, 9760 rear. Luckily, with the crew cab, it would be hard to go past 4800 unless you load the front hitch.I loaded a 4300 camper on the rear and only 60 went on the front axle   



#39 OFFLINE   dubob

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Posted 09 April 2013 - 03:03 PM

I always learn something from these post. My truck is a 2006 drw which has a front axle weight rating by gm as 4800 and rear axle rating of 8200. my wheels are rated at 2440 I believe. That is where I thought the wheels were the weak link in the front.Now I think I was wrong.  Dubob's 2008 drw, and correct me if i am wrong, has a front axle weight rating of 4860 and a rawr of 8200 by gm. His wheels are 17 inch and my wheels are 16 inch. His wheels are rated at 2800 if I am right, and his fawr was only increased by 60 lbs. I got the 4860 of the internet, so I may be wrong here. That tells me there is another factor for the ratings on the chevy front end, like maybe brakes. The chevy front end has an ifs, where as ford and dodge have a front axle similar to the rear. For me, I am going to stick with my rule as, 4800 front, 10000 rear. Luckily, with the crew cab, it would be hard to go past 4800 unless you load the front hitch.I loaded a 4300 camper on the rear and only 60 went on the front axle   

If what I’ve found so far is correct, my front axle by itself is rated at 6,000 lbs.  My single front tires are each rated at 3,085 lbs at 80 psi.  The 2,835 lb rating is for each of the four tires (two sets of duals) at 80 psi on the rear.  So right now, the weakest link in my front end is both the axle (6,000 lbs) and the two rims (3,000 lbs each).  The tires can hold up 6,170 lbs.  I have no clue why the GAWR for the front is only 4,860 lbs.  It could be the springs or the brakes.  I’m still looking into both of them.


:usa:
Bob Hicks, from Utah
I’m 76 years young and going as hard as I can for as long as I can.
“Free men don't ask permission to bear arms.” ― Glen Aldrich
“Be who you are and say what you feel, because those who mind don't matter,
and those who matter don’t mind.” ― Dr. Seuss

2010 Chevy Silverado 2500HD, SRW, 6.0L gas/2011 Lance 992


#40 OFFLINE   dubob

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  • Camper Brand:2011 Lance 992
  • Truck Make & Model:2010 Chevy 2500HD Silverado, 6.0L gas
  • Name (Public):Bob

Posted 10 April 2013 - 05:42 AM

I found out some more interesting information about shocks this morning.  I was looking for the weight capacity of the Rancho 9000 XLs and didn’t see it on the website so I called the company for that information.  I found out from them that Rancho doesn’t rate their shocks for weight capacity because their only purpose is to dampen oscillations in the suspension.  What surprised me about this is the fact that MOST discussions about the components in a suspension system that determine the payload usually include shocks as one of those components.

 

I also found a little bit of information about springs for my truck.  The biggest OEM spring I’ve been able to find so far is a 7/1 (8 leafs total) with a 3,300 lb capacity per spring and 6,600 per axle.  That doesn’t quite jive with a rear GAWR of 8,200 lbs.  Does anybody have an explanation about this apparent discrepancy?  I can't see what's on my truck right now due to the truck being in the shop.


:usa:
Bob Hicks, from Utah
I’m 76 years young and going as hard as I can for as long as I can.
“Free men don't ask permission to bear arms.” ― Glen Aldrich
“Be who you are and say what you feel, because those who mind don't matter,
and those who matter don’t mind.” ― Dr. Seuss

2010 Chevy Silverado 2500HD, SRW, 6.0L gas/2011 Lance 992





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