been having repeated problems with clunking noise in the rear end. Took vehicle in several times, dealer could not find anything wrong. The vehicle then would go out of gear while driving, then the dealer said the problem was in the transfer case. $1800.00 later & a month later the clunking noise has returned. The dealer says he doesn't know what the problem is, but has to take the transfer case apart again & doesn't know what the cost will. How many times is required to fix this problem?????