What I need is a 7/8 x 16 thread chasing die. The only one I found from a Portland tool shop was over $60! There have to be adequate and less expensive chasing dies out there. I've tried lots of places and they all say 7/8 x 14 nf is all they carry.
Any suggestions appreciated and if you have one laying about your shop you haven't used in years I would gladly purchase it or 'rent and return'

Background:
I'm putting new seals in a first series 10-bolt open driveline rear end and find the PO really buggered up the end of the pinion gear shaft. The nut was extremely hard to get off all the way out. I'm ready to put it back together and got a new 7/8 x 16 nut but can't get it started due to beat up condition on end of shaft.

I tried a thread file but it doesn't do the job.
Thanks again for any help,
Jerry