OK, Do I have a Dana 70 or 80?

[Mactruck]

Ive been looking for tags or stamps on my rear axle and can't find out if it is a 70 or an 80 rear end. A friend on TDR says it's an 80 because of the rear disc brakes. I thought it was a 70 because it's a 2500 and 3500's come with an 80.

see sig for details

thanx

 

[KatDiesel]

Auto + 2500 = Dana 70.

 

[EMDDIESEL]

Which one is better, the 70 or 80? i am guessing 80?. An how much better is it?

 

[Mr. Brewski]

10" ring gear versus an 11" ring gear. For comparison - Chevy 14 bolt floating axle 2500 truck is an 10. 5", a Chevy non-floating axle 14 bolt is a 9. 5", and I think the ford 250 floating axle trucks might be a 9. 875" ring gear. I hear that the Duramax trucks get an 11. 5" ring gear. I suppose that bigger is better, but I dont know if it would make a difference. All newer 2500 M/T trucks have Dana 80's with Dana 70 axle tubes and brakes and I'm pretty sure they'd bolt right into where your Dana 70 resides.

 

[Mr. Brewski]

Also - My truck has a sticker under the hood on the back side of the hood that specifies the drive train. Mine says Dana 80 hybrid in the rear. Dana 60 front axle, NV4500HD, and I dont remember the transfercase numbers...

 

[Chris N5CWM]

Look on the center section, front left of axle

I have heard that all of the 3500 Rams have the

Dana 80, and all Cummins powered 2500's with a

manual transmission have a Dana 80. The automatic 2500s

have a Dana 70. I don't know the difference

between the 70 and 80 but Fritz' Ram Page should

enlighten anyone. . I forgot the link!



Mine is a 2001. 5 disc-brakes all around, 5 speed

manual. It even says Dana 80 on the sticker in

the glove box. The front axle is a Dana 60.



Also mine has a big 80 cast into the center

section of the rear axle. Look for it on the

rear axle, driver's side, front of the rear

alxe.



-Chris

 

[John]

Auto equipped 2500s have the Dana 70.



I know one thing, I've seen MANY more Dana 80s being rebuilt at two different Dodge dealers than Dana 70s. Bigger isn't always better.

 

[John]

Re: Look on the center section, front left of axle

Originally posted by Chris N5CWM

The front axle is a Dana 30.

That's not true Chris. All 4x4 2500s and 3500s have the Dana 60 up front.



Good info. Mr Brewski (2500 Dana 80 is a hybrid... Dana 80 differential, Dana 70 peripherals).

 

[Jff24Gordn]

If you want to know where the 80 turns into a 70? Look at the axle shaft next to the brake. You will see the housing neck down between the brakes and the springs. This where the axle shaft also necks down.