tankeryanker

My dana 70 has a weight rating of 6084 & I was wondering what the one ton dana 80 is rated for? I know the 2500 with 80's are a hybred with the same rating as the 70's. Is there a difference between the srw & duall rear wheel dana 80 GAWR?

CTD NUT

SRW and DRW D80's both have the 7500lb GAWR.....but you would have to go to 19.5" wheels on the SRW to take full advantage of the 7500lb rating.......DRW D80's tires exceed the GAWR........

tankeryanker

Thanks ctd nut
I couldn't find the rating anywhere for the dana 80 since they changed over to american axle. I was thinking of looking for a donor for my 2500.

Patrick Campbell

I doubt the rating of a Dana80 is "only" 7500. It has a 11 or 11.25" ring gear. The AAM 11.5" is an 11,000# axle! The AAM 9.5" is something like 6000#. And the AAM 10.5" is a 10,000# axle.

mkubacak

Here is some data:

http://www.dodgeram.org/tech/specs/axle/rear_axle.html

According to this, that hybrid is only 6500 lbs.

Patrick Campbell

I have done a lot of googling on this. Finally found a Dana PDF that describes Dana44 - Dana80. Dana80 is rated to 11,500. They don't differentiate between the semi floater and full floater.

However, there's 3 different models of 70's ranging from 7500 to 10,000#. In my opinion, the figures of 6500 or 7500 are incorrect. These are Dodge figures that match up to the tire rating, not axle ratings.

CTD NUT

The axle ratings from Dodge are their own that have a safety and tire factors built into their ratings that pertains to DC's specific applications........the axle manufacturers ratings are the absolute limit for weight carrying capacity and are not based on the hardware or method to locate them or what they are attached to, the GVRW of the vehicle or the intended application of the axle assembly.

Patrick Campbell

Right so when you're upgrading, it is good to know what needs upgrading and what doesn't. The real Dana 80 GAWR is not 7500, it's 11,500, something else like tires, suspension, marketing, etc. is what is bringing down Dodge's rating.

tankeryanker

njoverkill
I found your dodge towing guide very informative. I have been kicking around the idea of swaping out my dana 70 for a 80. & maybe making my truck into a dually. I'm looking for more stability & saftey factor for what I'm towing.
My 5vr weighs 12,000lbs loaded & my truck weighs 7350, my pin is 2350 & I know I'm exceeding my gvwr & my gcwr. She tows great with the set up I have & I'm not over loading my axle or tires I still have 700lbs to reach axle rating & 1400lbs to reach tire rating at 70lbs 265/75/16.
I've read countless threads on tow ratings also & I wish I had a dually but I've got too much $$$ invested in this truck to try & sell or trade off.

roadranger

That spec sheet only goes up thru the '98 model year.

In the spec section of Dodge's 2001 Ram catalog, it states that the Dana 80 hybrid rear axle weight rating for a diesel, manual transmission, with CAMPER OPTION, is rated at 7500 lbs.

Good thing! As I'm running 7250 lbs on my rear axle with 19.5 tires with the Truck Camper onboard.
40K+ miles so far with no problems...

The tag on the doorjamb still rates the rear axle at 6080 lbs, or so. That's tied to the TIRES that the truck was built with.

CTD NUT

I think some of the later model SRW hybrid rears are the ones that are DC rated at 7500lbs - probably the trucks that were factory equipped with 265/75's instead of 245/75's............

Roadranger,
That is a beautiful slide-in you have..........do you know the dry weight?..........IMO, you are fine with 7250lbs on your rears if you have the appropriate suspension mods to handle it - your 19.5's are certainly not holding you back! .......I had about 6400lbs+ on the rears of my 2500 with a D70 rear when my 3500lb slide-in was all geared up and I was clearly under the limit of my 265/75 E tires so I think you are fine.

Patrick Campbell

tanker according to Dana, the lowest model 70 is a 7500# axle. Even if it's a 6500#, you're well within the limits.

I would say run 80 PSI not 70 PSI in those tires (they're 3415# per tire tires right?) if you want a little more safety margin.

If you wanted to be even more safe without converting to dually you could go with 110 PSI load range G commercial 16" tires in a single wheel config.

tankeryanker

I went out & looked they are 3415 at 80lbs. I've been running 70lbs because thats what the tire book I got with my owners manual said to run for full load. Guess I'll bump it up to 80lbs & not worry about.
I've been driving truck for 30yrs & I know on a comercial rig all they are concerned with is weight per axle. I don't know why dodge has such low gvwr on these trucks. Sticker on my door panel says 6080 gawr.

Patrick Campbell

10 PSI is a pretty big difference. I think you're perfectly well with that load on those tires and that axle!!

roadranger

Tanker- Yeah, the sticker says 6080, BUT it also goes on to say "with (tire size)"

You'll find the Dana axle is rated for a LOT more weight.


The Mfg. sets the GVWR of a truck to cover themselves on warranty work, that's why they are much lower than the actual combined axle ratings.