I have a bad shake at around 60 mph

Have it hoisted on a drive-on lift that has lift jacks and try to duplicate problem by running it in gear... Possibly drive line problem.. U-joint or driveshaft issue... U-joint may be LOCKED UP and will need to remove shaft to check!.. Just some possibilities as you didn't really indicate where shake seems to be comming from... Front, back or just throughout the vehicle.