What gear ratio are you looking for?

 

Make sure the rear you get came out of a 2nd gen truck. If not, the spring perches may not be in the proper location and new spring perches and grinding/welding may be in order.

 

The parts manual is your friend. Listed single wheel Dana 80 components (axles) back to '94, diesel or V-10.
From TorqueKing up in Billings: "Dodge used Dana 80 Rear Axles in Ram 2500 models equipped with Cummins Diesel or gas V10 engines and manual transmissions. The Dana 80 was also used on ALL Ram 3500 trucks regardless of engine or transmission."
They sell disc brake components for SRW/DRW Dana 80 axles, 2001-2002: https://torqueking.com/category/brakes-1994-2002-ram-dana-80/.
https://torqueking.com/category/expl...-ram-dana-80r/
This page is especially useful, lists ( apparently) all possible combinations.

 

Looking for a 4.10

 

Poking around O'Reilly's site (which is where I've had problems before), they list a D80 wheel seal which does seem to be for drums as they also list 13x3.5" brakes (these are dims you'd only give for a drum) with 3" ID

However the "D70" seal has a 2-7/8" ID, which is what our disc'ed '02 uses. It definitely has a D80 chunk but the spindle is smaller.

 

Since the 70's and 80's are both full floaters, does what brakes it have on it even matter?

 

Only if the true 80s were only offered in drum and the hybrid 70/80 in disc.

I'm not saying this was how they were offered as I don't know 100% -- merely that if so it's another form of identification.

 

I am curious what their criteria was for if a truck got a "real" 80, or a 'fake' 80.

 

The rear hubs and the brake parts where not made by dana. These were all made by Chrysler so you need to look at the parts book to determine any differences.

 

Got one! here is a picture!