im wanting to widen my d70hd 3 inches per side and im wondering where i can get custom shafts.

try randys ring and pinion. they sell different lengths of shafts.

How about some real information, such as how wide it is now, or how wide you want it.

With that little bit of information, you could quite likely find something close to what you want in a salvage yard.

I'm guessing you don't have the Chevy version, because that's pretty damn wide already. If you do have the Chevy version, then the easiest way to widen it is to just swap some SRW 14 bolt hubs onto it.

possibly be cheaper for you to run bolt on spacers. seen em on ebay for around a bill.