from chevy the 2500hd and 3500srw with d/a combo have the same aam 11.5 axles.
2500hd is garw rear is 6084 front is 4670
3500srw is gawr rear is 6500 front is 4800

is the 420 extra pounds that the 3500 has on the 2500 because of the extra leaf spring?

im asking this because i put 3500 srw spring pack on my 2500hd because of the 3000lb pin weight of my toyhauler.

Spring pack, bigger tires on wider rims. 3500srw's come with 265/75 on 16x7 rims.

Mine actually has 2 more springs than a 2500HD. They only did that a couple years though.

I think it's based on the tire load capacity. The axle cap is larger than the listings!

jb

Spring pack, bigger tires on wider rims. 3500srw's come with 265/75 on 16x7 rims.

Mine actually has 2 more springs than a 2500HD. They only did that a couple years though.
as you see in my sig the 285/70/17 i have now are each for 3750obs rated e. think i read somewhere that the axles are rated for 6900

IIRC the axles rated from the Maufacturer are 11,500

IIRC the axles rated from the Maufacturer are 11,500
yess it is;) for all 1150 AAM axles

IIRC the axles rated from the Maufacturer are 11,500
knew it was somewhere around that. thanks!

But that doesn't mean that chevy is rating them at that.

But that doesn't mean that chevy is rating them at that.
the 3500 and 2500 at basicly the same frame... the rear spring on a drw is 8000 plus pounds


unless you are running 19.5 or heavyduty tires ie 4,000 and greater. you are going to hard pressd to bend the frame:cool:

i have no problem putting 4k in the bed of my 2500hd:) just as long as the tires can hold hte weight

But that doesn't mean that chevy is rating them at that.
and im assuming that chevy under rates the axles for liability reasons

I would believe they would rate the rear end at the lowest componant which I think would be the rims. They don't sell rear ends they sell the entire truck with said parts from the factory and then underrate that for liability reasons and wiggle room to up ford or dodge the next year :)

I would believe they would rate the rear end at the lowest componant which I think would be the rims. They don't sell rear ends they sell the entire truck with said parts from the factory and then underrate that for liability reasons and wiggle room to up ford or dodge the next year :)
dodge is running the same 1150 rear end;)

I'd venture to guess they need the heavy axle to stand up to the torque from the diesels more so than the 11,500# carry capacity. Also the braking system is also rated for the axle capacity.

I would believe they would rate the rear end at the lowest componant which I think would be the rims. They don't sell rear ends they sell the entire truck with said parts from the factory and then underrate that for liability reasons and wiggle room to up ford or dodge the next year :)
Yes, you are correct, they rate them for the weakest component.

The sticker on my 2500HD says that the rear GAWR is 6,084 lbs, which is the number shown on the GMC website for the rear suspension capacity.

The stock LT245/75R-16 E tires are rated for 3,042 lbs @ 80 psi.

3,042 x 2 = 6,084 :)

Yes, you are correct, they rate them for the weakest component.

The sticker on my 2500HD says that the rear GAWR is 6,084 lbs, which is the number shown on the GMC website for the rear suspension capacity.

The stock LT245/75R-16 E tires are rated for 3,042 lbs @ 80 psi.

3,042 x 2 = 6,084 :)


try that with the the DRW setup it is about ~12,000 and gm say ~8,000:rolleyes: i can remeber wha a 215/75/16 is rated for i think 3,000? x4 is 12,000

Not quite :)

LT215/85R-16 (E) tires are rated for 2,680 lbs when mounted as single and 2,470 lbs when mounted for duals.

So the rear tire capacity for a dually with those tires would be 9,880 lbs.

2,470 x 4 = 9,880

Spring pack, bigger tires on wider rims. 3500srw's come with 265/75 on 16x7 rims.

Mine actually has 2 more springs than a 2500HD. They only did that a couple years though.

Where did you get the info on wider wheels ?
From what I have seen they are all 16x6's

Where did you get the info on wider wheels ?

From what I have seen they are all 16x6's

From the GMC website

2007 / 2008 2500HD
Standard Wheels (PY2): 4 - 16" x 6.5" (40.6 cm x 16.5 cm) 8-lug chrome-styled steel, includes chrome center caps and steel spare (spare wheel will not cosmetically match the other 4 wheels).

Optional Wheels (PY0) : 4 - 16" x 6.5" (40.6 cm x 16.5 cm) 8-lug polished forged aluminum, includes chrome center caps and steel spare (spare wheel will not cosmetically match the other 4 wheels).

Optional Wheels (N89) : 4 - 17" x 7.5" (43.2 cm x 19.1 cm) 8-lug bright machined aluminum, includes 16" (40.6 cm) steel spare wheel (spare wheel will not cosmetically match the other 4 wheels).
2006 / 2007 / 2008 3500HD Dually
Standard Wheels (QR5): 6 - 17" x 6.5" (43.2 cm x 16.5 cm) 8-lug painted steel, includes painted center caps and a steel spare (spare wheel will not cosmetically match the other 6 wheels).
2006 / 2007 / 2008 3500HD SRW
Standard Wheels (QC1): 4 - 16" x 7.0" (40.6 cm x 17.8 cm) 8-lug steel (single rear wheel).

Optional Wheels (NZ7) : 4 - 16" x 7.0" (40.6 cm x 17.8 cm) 8-lug chrome-clad steel (single rear wheel) (spare wheel will not cosmetically match the other 4 wheels).

Where did you get the info on wider wheels ?
From what I have seen they are all 16x6's

It says so on my door jam.

Interesting enough though the spare tire is on a 16x6.5 rim. I guess the wider rim doesn't fit underneath within GM's specs :rolleyes:

my tires are a 285/70/17 and say 3750ea.
does that mean that i have a 7500 pound rear end capicity?

my tires are a 285/70/17 and say 3750ea.
does that mean that i have a 7500 pound rear end capicity?
spring are rated for 6000 pounds (on a 2500hd) you would ride the bump stops;)

with out air bags

spring are rated for 6000 pounds (on a 2500hd) you would ride the bump stops;)

with out air bags
put on a add a leaf to it AND air bags. im good to go! lol

I know that my 2500HD will carry 5500 lbs. of feed, done it a few times.... tends to wiggle a bit though

biggest load was 132 50 lb sacks of feed from the mill, that was a bit of a hairy ride home (25+ miles) so that ride was closer to 6500 lbs+/-

No one has mentioned that the rear axle tube on a 3500 does not "neck down" right out of the center section like the 2500hd does. I would think for that reason the 3500 axle would have a higher capacity, but I dont know.

It rides the bump stops after about 4000lbs of load.

Is it possible to just add dual rear wheels to a 2500HD, air bags and fender flares and I got a dually? I already bought my 2500HD and now I have a new need for a larger capacity. Will it be legal? Trading in isn't an option as the truck has depreciated too much and I can't take that much of a financial hit. Plus it would be cool to have a short box dually.

Is it possible to just add dual rear wheels to a 2500HD, air bags and fender flares and I got a dually? I already bought my 2500HD and now I have a new need for a larger capacity. Will it be legal? Trading in isn't an option as the truck has depreciated too much and I can't take that much of a financial hit. Plus it would be cool to have a short box dually.
dually springs are rate for ~4000 each side to be legal you would need DOT to buy of on it

No one has mentioned that the rear axle tube on a 3500 does not "neck down" right out of the center section like the 2500hd does. I would think for that reason the 3500 axle would have a higher capacity, but I dont know.
2500hd and 3500 are the same axel

dually springs are rate for ~4000 each side to be legal you would need DOT to buy of on it
arent 2500hs springs rated for like 6000?

arent 2500hs springs rated for like 6000?
3000 each side 6000 total for 2500 same with 3500srw iirc

drw is 4000 each side 8000 total

Quote:
Originally Posted by 01sierra2500hd http://www.dieselplace.com/forum/images/buttons/viewpost.gif (http://www.dieselplace.com/forum/showthread.php?p=2067454#post2067454)
No one has mentioned that the rear axle tube on a 3500 does not "neck down" right out of the center section like the 2500hd does. I would think for that reason the 3500 axle would have a higher capacity, but I dont know.

2500hd and 3500 are the same axel



Im not trying to argue with you, but I have seen more than one 3500 that has the bigger axle tubes. The 11.5 inch 2500hd axle tubes get smaller right out of the center section, while the 3500 are the same size all the way to the backing plates. Maybe there are differences between years or something. I will see if I can round up some pictures to show you the difference.

Quote:
Originally Posted by 01sierra2500hd http://www.dieselplace.com/forum/images/buttons/viewpost.gif (http://www.dieselplace.com/forum/showthread.php?p=2067454#post2067454)
No one has mentioned that the rear axle tube on a 3500 does not "neck down" right out of the center section like the 2500hd does. I would think for that reason the 3500 axle would have a higher capacity, but I dont know.

2500hd and 3500 are the same axel



Im not trying to argue with you, but I have seen more than one 3500 that has the bigger axle tubes. The 11.5 inch 2500hd axle tubes get smaller right out of the center section, while the 3500 are the same size all the way to the backing plates. Maybe there are differences between years or something. I will see if I can round up some pictures to show you the difference.


intresting, yes if you can include some pics that would be helpful. i believed that they were all the same

Well, I've got a 3500srw. What kind of pic do you want? Where the axle and differential meet?

The trucks with the 6.0 get a smaller axle IIRC. You sure you're not looking at one of those?

Well, I've got a 3500srw. What kind of pic do you want? Where the axle and differential meet?

The trucks with the 6.0 get a smaller axle IIRC. You sure you're not looking at one of those?

just where the axle and diff meet.

6.0L trucks are of semi-floating design, 8.1L and diesel models get the full-floater. Anyone know if the new H.O. gas engine gets the semi or full floater??

2500HD and 3500 with the 6.0 still get a full floater, just not the same 11.5. I believe it's a 10.5??? My work truck is a 2500HD 6.0 and it most definitly has a full floater. The 2500LD got a semi-floater.

Here's those pics of my 3500srw axle I promised. I do have the 8.1....just to clarify. If you need different angles you'll have to wait until it stops raining. :D

http://i2.photobucket.com/albums/y47/trouttrooper1/axle1.jpg

http://i2.photobucket.com/albums/y47/trouttrooper1/axle4.jpg

I have a 07.5 nbs 3500 srw 6.0 353 hp the owners maual refers to a 2500 with a smaller rear axle that has the fill plug facing forward and the 3500 with the plug at the back facing rear,this is the same axle that was a 3500 dually with a duramax that I traded and in my 07.5 srw .A friend has a 07.5 nbs 2500hd has the forward facing plug. This issue will be always be debated

trouttrooper thanks for the pics. they'll be fine

6.0L trucks are of semi-floating design, 8.1L and diesel models get the full-floater. Anyone know if the new H.O. gas engine gets the semi or full floater??

There has never been a semi-floating axle on a 2001 and newer 2500HD.
As has been stated, 10.5 incher with the 6.0 and 11.5 with the 8.1 or Dmax and the NBS continues this same setup.

The 10.5 is for the 2500HD only. The 3500 trucks even with the 6.0 will get the 11.5.

:saluteusa: