Originally Posted by Rock Ape
I can get you some 10k upper bull gears and Good stock C/Vs since they get tossed when I do some of Jesse's H1 boxes as all of his get converted to the bigger spline.
I believe the inner shafts are all the same, I don't know what the stock diameter is for a d30 but so long as it can be machined down to 1.15" and splined you are golden.
We went over all this together about 10 years ago. It was determined then that on paper it would work. But I'd be thrilled to physically put some together.