Just bought a 98 cruiser today! 190,000 miles and it runs great. Drove it home at 70 mph on the interstate with no issues, the engine and ride was very quiet. I found some mud and sand close to my place to have a little fun. The center diff lock came on, and the ABS went off when shifting into low range as expected. But the rear diff wouldn't lock up. Any thoughts? Thanks in advance for the help guys.