Will fit the 4 3/8" retainer nut and not fit Bravo 2, 3, XR, or TR. Drive Spanner Wrench. Function — Used to remove and install driveshaft housing (upper) bearing retainer nut (By U joint shaft) on #1 (1982 and earlier), R, MR, Alpha Gen 1 (1983 -1990), Alpha Generation ll (all), MC1, and all Bravo and Blackhawk units.
