So I got a VLSD from a 180SX...I want to put it in my S13. The diff has 5-bolt output shafts, and came with only one axle. The axle measures 23.5 inches at rest....so I am assuming it is a drivers side JDM S13, or J30 axle. I dont want to use a J30 passenger side axle because of the length difference. So I went to pull a set of output shafts from a 6 bolt J30 diff. But it turns out they are about 1/4 inch longer than the S13s outputs. All the grooves and splines seem to match up...It looks like the length difference is all in the oil seal surface. So, despite the dust cover not seating all the way, this output shaft should work and not leak right? In my mind this seems like a better idea than using an axle that is 1/2 inch too long....this way I only have an extra 1/4 inch of axle.

Anyone done this before? Here are some pics of the shafts and the result...

S13 output



J30 output


J30 installed in diff....stock diff housing to axle flange measures 2 inches, not 2 and 1/4.