Question about GVWR.

donn0128 wrote:
GAWR is the weight rating for one single component the axle.

This is false. The GAWR is defined by the NHTSA and DOT to be the measure of the limit of the axle system which includes suspension and tires. It is not just what the axle itself can handle

"The Gross Axle Weight Rating (GAWR) is the maximum weight that the designated axle system is designed to carry. It is set by the OEM and noted on the vehicle's original certification label. Alterers must determine whether their modifications affect the manufacturer's stated GVWR or GAWR. If they do, the alterer must specify the new GVWR or GAWR on the alterer's certification label (see 49 CFR 567.7). Note: A modifier or dealer should never accept an altered vehicle that does not have an alterer's certification label."

http://www.nhtsa.gov/cars/rules/adaptive/Inoper/Fre_ask_Ques.htm

"GAWR (Gross Axle Weight Rating) – The GAWR is the value specified by the vehicle manufacturer as the load-carrying capacity of a single axle system. Each axle on a truck (and trailer) has a maximum allowable weight capacity. As previously noted, the GVWR of a truck is usually less than the combined GAWRs of all of a truck’s axles. The GAWR is limited by the weakest link in the axle system which also includes the suspension and the tires. For example, an axle with a design rating of 21,000 pounds may be rated lower due to the rating of the selected suspension (springs) or tires. When calculating the design load on an axle, make sure to take into account any weight transferred to the axle from a trailer (tongue weight) and the potential placement of cargo."

https://www.ntea.com/content.aspx?id=20194


If the GAWR set on manufactured trucks was just the axle, then the 11.5" AAM axle in my truck would have a GAWR of it's rated 10,000 lbs instead of its axle system rating of 6,500 lbs.

http://en.wikipedia.org/wiki/10.5%22_Corporate_14_Bolt_Differential#11.5_AAM