I have a 300SD with 125K miles in great shape. I have some sifting problems and have tired all of the usual things ie checked the vacuum, readjusted the modulator, adjusted the bowden cable but still get hard 1-2 shifts and flare 2-3 and sometimes stacked shifts. I am wondering if anyone has tried the fix listed on the web site below. It sounds just like the problem that I have and have not been able to cure. After talking with the people I find that the kit is meant to be installed at overhaul but it appears that the shift kit can be installed without removing the tranny. Any comments or experience.

http://www.bulkparts.com/MM007.ASP?

Superior Shift correction 722.3 / 722.4 Diesel
# 85931 Superior Kit K722A-D This valve body kit deals with these problems: Harsh 1-2 shift Soft or flare 2-3 shifts Slip or flare 2-3 (cold) Soft or flare 3-4 shifts Stacked 2-3 shifts