I think the best way out on that axle is to look for a complete set of backing plates. I bet you need to find a set from a 3/4 or 1 ton chevy full size van (not a bread van). I remember measuring one many years ago to use as a possible swap into a 72 C30 I had. It was around the same width you measured. It will have emg brake cable mount provisions close to the stock Dodge set. You will still need the Dodge cables. The Chevy's use a two short cables that attach to a long cable the runs threw two balance points to apply the same tension to both sides. The Dodge uses one short cable and one long into a single metal balance to pull both cable the same amount. That is why brake adjustment is so critical on a Dodge rear brake setup. It doesn't have the travel that the GM setup does.
If you are running duals. I don't think a set of Dodge rims will clear 13" drums.
I just did a little looking at this site. Look at the GM 10. 5 ring gear gasket. flip it 180 degrees and it is for your cover. The model 70 has a different cover gasket.
http://truckparts-specialists.com/catalog/axles/axle-gasket-picture-index.htm
Looks like 73 to 97 anything C/K/G models. So that opens the selection up some. C/K are pickups. G is full size vans. The V series I have know Idea what that body style is. I think this is the axle that is called the 14 bolt corperate model.
If you are running duals. I don't think a set of Dodge rims will clear 13" drums.
I just did a little looking at this site. Look at the GM 10. 5 ring gear gasket. flip it 180 degrees and it is for your cover. The model 70 has a different cover gasket.
http://truckparts-specialists.com/catalog/axles/axle-gasket-picture-index.htm
C/K 35, G30, V 15/35 1973-97
Looks like 73 to 97 anything C/K/G models. So that opens the selection up some. C/K are pickups. G is full size vans. The V series I have know Idea what that body style is. I think this is the axle that is called the 14 bolt corperate model.
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