I have a 2007, manual 6speed with 250,000 miles. While driving up my snow covered driveway the other day, I tried to shift into 4wh, but the lever would not budge. Have used 4wd multiple times this winter without incident. Have tried rocking back and forth, shifting in n, jacking up to release any tension on wheels, but nothing. Anyone else with this issue? Suggestions that don't include replacing transfer case?