Not sure why yours is an issue. It could be an individual clearance thing as mentioned by an earlier post? You are essentially reporting that the diff drop's drop amount would not have mattered, and that you hit even with spacing the plate away by that amount...so the drop made it hit MORE, but that it would have started out hitting even w/o the drop....is that correct? (Hits WITH 3/8" skid spacer)
The offset holes can be confusing...the bushings you put on the diff go hole up, and the ones on the (Front?) cross member hole down, IIRC....or maybe one was the opposite of the others? (so if you do them all the same, or reverse the up/down, it might tilt the diff and be a potential issue?)
I did mine back in ~ 2003-2004 or so, and didn't think to do a write up or take pics, etc...and I'm a bit dyslexic...but think about the offset hole orientations and if that might be at play.
Basically...the idea is to lower the diff, and, some of the locations its being held up...so, lowering the hole lowers the diff, and, some the diff is holding it self, and, raising the hole lets it down.
I'd have to look again to remember which is which...but, now that I'm thinking about it...it might be one goes the other way...and the way to get which is which...is to look at it, and see if the hole needs to be up or down to lower the diff. The ONE that goes the OTHER WAY could be the problem, logically.
I hope that's not too confusing.
:sure: