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Old 04-07-2019, 10:42 AM   #1
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axle weight capacities and GVWR

Just a newbie question about axle weight capacities and GVWR on my Frontier.
The GVWR on my front axle is 3296 lbs and the rear axle GVWR is 3331 lbs.
The combined axle capacities add up to 6627 lbs
The GVWR for the truck is 5730 lbs.
Am I correct to assume those are weight limits for the axles as long as you don't exceed the GVWR of 5730 lbs?
I'm just kind of flummoxed why the axles are designed to carry more than the truck.
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Old 04-07-2019, 10:50 AM   #2
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Yes. The axles are rated more than the overall rating of the truck to give you some flexibility in loading the vehicle.
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Old 04-07-2019, 11:11 AM   #3
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Quote:
Originally Posted by upflying View Post
Just a newbie question about axle weight capacities and GVWR on my Frontier.
The GVWR on my front axle is 3296 lbs and the rear axle GVWR is 3331 lbs.
The combined axle capacities add up to 6627 lbs
The GVWR for the truck is 5730 lbs.
Am I correct to assume those are weight limits for the axles as long as you don't exceed the GVWR of 5730 lbs?
I'm just kind of flummoxed why the axles are designed to carry more than the truck.

It's called "Safety Margin". Not just a margin for loading but also some margin for when the vehicle is loaded to it's cargo limit and then hits a large bump in the road. Designers allow for dynamic loading as well as just static load.
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Old 04-07-2019, 12:02 PM   #4
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Yes. Total ok according to your engineer. In trucks it has to do with plates.

Likely your engineer saw something else that was not as stout as the axles!

The tires maybe. Read their max rating on the tire. The brakes maybe. State liscense rules, maybe. U joint strength. Maybe the four wheel drive similar vehicle has upgraded stuff. For fun look at Rams payload rating on its line of hd trucks. Essentially my trucks payload can be from #1700 to #7000 with dual rear wheels.

It is convoluted. Not engineering safety margin I think. He would say the max weight is as stated. Between us boys, there is a 20% safety margin. Not ment for every day. But cheating once in a while is ok. Unofficially.
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Old 04-07-2019, 01:21 PM   #5
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Yes. Total ok according to your engineer. In trucks it has to do with plates.

Likely your engineer saw something else that was not as stout as the axles!

The tires maybe. Read their max rating on the tire. The brakes maybe. State liscense rules, maybe. U joint strength. Maybe the four wheel drive similar vehicle has upgraded stuff. For fun look at Rams payload rating on its line of hd trucks. Essentially my trucks payload can be from #1700 to #7000 with dual rear wheels.

It is convoluted. Not engineering safety margin I think. He would say the max weight is as stated. Between us boys, there is a 20% safety margin. Not ment for every day. But cheating once in a while is ok. Unofficially.
I kind of figured that, the drivetrain is not engineered and designed for the load capacity of the axles. IIRC, the Frontier has many Titan components such as the frame and suspension, it's just a bit narrower. It may carry the load but not without comprising the integrity, safety and reliability of the brakes, tires, engine, transmission, driveshaft etc.
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Old 04-07-2019, 01:23 PM   #6
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Towing and GCWR

You really need to look at GCWR... Gross Combined Weight Rating. This is the number not to exceed overall. I looked up your truck and found this info:

without tow package 12,800 Gross Combined Weight Rating
with tow package4 15,100 Gross Combined Weight Rating

Numbers are 2WD

That means without tow pack your loaded camper and loaded truck should not exceed 12,800 without tow pack or !5,100 with tow pack.

Axle rating and GVWR is also important but be sure to consider GCWR. That's the main reason why I went from a 1/2 ton to 3/4 ton for towing my 6500lb Flagstaff 26FKBS
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Old 04-07-2019, 02:20 PM   #7
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Originally Posted by thom125 View Post
You really need to look at GCWR... Gross Combined Weight Rating. This is the number not to exceed overall. I looked up your truck and found this info:

without tow package 12,800 Gross Combined Weight Rating
with tow package4 15,100 Gross Combined Weight Rating

Numbers are 2WD

That means without tow pack your loaded camper and loaded truck should not exceed 12,800 without tow pack or !5,100 with tow pack.

Axle rating and GVWR is also important but be sure to consider GCWR. That's the main reason why I went from a 1/2 ton to 3/4 ton for towing my 6500lb Flagstaff 26FKBS
The GCVWR on my tow package Frontier is 11,133
With an empty truck and trailer sitting on the CAT scales, I am at 8940 lbs.
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Old 04-07-2019, 03:47 PM   #8
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The axles themselves can have different ratings depending on how the axle is equipped. Vehicle manufacturers rate axles as a unit, including springs, wheels and tires. The actual axle could be much higher on its own capacity. Often the same axle (which is not made usually made by the vehicle maker) could be used on more than one truck makers designation numbers like 2500 or 3500. Many axle manufacturers sell axles to various vehicle manufacturers, so some many truck brands have the same axles with different ratings.
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