Logan I just did the flush on both of my jeeps ax-15 and NV3550. The ax is going out ( syncro's ) so I did the flush hoping for a miracle, it helped but replacement is in the very near future. The NV 3550 was just shifting hard into 2nd the flush and new RP syncromesh cured it.
1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML Engo 9K winch, Dick Cepeck Radial F-C 33/12.5/15.