i have a 1996 4runner with 236k. its a 4 banger with 5 on the floor. i live in maine and im having an issue with the 4wheel drive this winter. i engage 4 hi to drive in snow and in 4th gear, while driving, she pops out of 4 wheel drive and i end up in the ditch. no noise comes from 4wheel drive at all,it seems to sound smooth easy shift in and out. this happens 2times and then it stays engaged...what to do??!! 
