Dodge Dakota rear ends....

One trick I've read about is removing the "long" side axle tube, cutting it down to the same as the "short" side, and using another short side shaft. I think that's good for 4 inches and centers the diff.

I friend of mine has a son that has the tooling and software to re-spline axles.
I don't know how much it was, but they sure weren't rich last time I checked.
In fact, I'm pretty sure it has paid for it's self from the work he does for others, simply by word of mouth.
I think he does a lot of Ford 8.8 stuff and charges about $50 cash per pair.

I have a 99 Dak 9 1/4 with 3.92 SG I hardly paid anything for, and have been thinking about running it in my 73 Charger. I think those wheel wells will tolerate the extra length.
i also have an extra set of Dak R/T wheels to go with it.