"too much" depends on the condition of the springs and the presence, and condition of, the bottoming bumpers - correct shocks for the TF trucks:
front shocks - Monroe 3100 [each] or Gabriel 82047
rear shocks - Monroe "Limited Edition" LE10018 [come in pairs] or Gabriel 82060
those mounts breaking isn't uncommon depending on how the truck has been treated over the years - wrong shocks, weak or broken springs, lotsa use on very rough roads - as Lumbergh sez, metal does fatigue, and those mounts weren't designed to last any longer than the rest of the truck
Bill
