The subject says it all. Search revealed several posts about someone regularly staying locked on high speed sand runs. IdahoDoug, i think, mentioned the danger factor with high speed steering problems when locked and that makes perfect sense. What I would like to know is what is the maximum safe locked speed that the 80's can do (all of this assuming that you have the center diff lock switch so that you can stay locked while in 4HI)? When I say safe I mostly mean from a mechanical point of view not a driving point of view; in other words, assuming you can do the driving part of it, at what point would damage occur to the lockers as a result of speed? Also, does any damage occur when the speedometer skips up to twenty or thirty, like on a snow run when the lockers are plowing through and then they spin out for a second? As always, thanks folks.