i drove up to a jobsite and put my '05 bighorn cummins
formatting link
into park. i sat there for a second finishing some paperwork and got out to walk inside leaving the truck running so that it would be cool inside when i got done. as soon as i slammed the door shut the truck took off in reverse headed for the highway. i was finally able to run it down and get in to hit the brake. i cant quite figure out what happened and since i had sat stopped for several minutes before exiting i can only conclude that it jumped put of park somehow. anybody ever had this happen? several times ive had a little trouble getting it into gear but dismissed it as being tight because its new.