I just took my '87 60 for a romp in the snow and it kept popping out of 4wd hi. I've searched past threads with no real answers. It pops out when not under load. When on the throttle or off the throttle it's fine just when trying to hold constant speed it pops. No noise just the 4wd light will go out and no 4wd. I didn't have this problem during the summer with trail riding so I'm thinking maybe something temp related. The cruiser was parked in the garage dry (but cold) prior to my snow adventure and popped out as soon as I took off down the road. Looking for possible causes because it's kinda scary to get on the gas expecting it to hook up and then having the rear end just kick out spining.