I need to replace my rear ring and pinion, but I'm not sure on the ratio.

On the ring gear, I see stamped "3507647 3.5(?)?"

I can clearly see the 3, the second number looks like it MIGHT be a 5, third is pretty much just a dot. Is it likely this is a 3.55?

I know I could count the teeth but before i go to that just wondering if someone has some insight.

Eventually this will all be changed over to 4.56 but right now it just needs to match what was in there to get it back on the road.

Thanks in advance.

 

Sometimes(usually?) they just put the first two numbers. My Durango has the 3.92 and I have found tags on the front and rear differential that just say 3.9 so yours is probably 3.55

 

If it helps, it used to be an Auto (now a 5 spd). Was 3.55's a common ratio?

The reason I want to know is because I was thinking about going to nab a different rear end from a junk yard until I get this one rebuilt with 4.56's (and then do the front) but in the mean time I'd like it back on the road and still be able to use my 4 wheel drive if needed.

 

It was pretty common I think. There might be a tag in your glove box telling you what it is, or you could get a free build sheet from dodge and it will tell you for sure.

 

my 2001 4x4 sport is a 3.55. Mine had a lable in the glove box that had those specs.

Edit: Ha ^ maybe I should read replies before I reply. beat me to it

 

Thanks guys!

 

Alright, so I was going to get a used rear to replace my broken one while I rebuild it - but I notice the yolk is different pre-2000, where mine has the flat plate and the others have the yolk where the ujoint bolts to. Can this be swapped, or is there a difference in the pinion?

Also, why the hell do durango's have 6 bolt lugs ... and are they the same rear besides the axles?

 

The pinion flange can be changed over to a yoke style or visa versa, no problem doing that.

 

Anything special you need to do that, or is just unbolt one, bolt on the other?

 

In the FSM there is a area going over how this is done, so in the 2001 fsm page 168 pinion seal replacement this gives you an idea on how to do this job. The FSM can be downloaded from the diy are here on DF.