Power Train Driveline problems of the 2003 GMC Sierra 1500

2003 GMC sierra truck, steering, has a clunking noise started about 5,000 miles, told by mechanic to take to a dealer, was not the first time he had heard of this problem and was not something he wanted to undertake due to liability, another problem with to much play or (slap) in the drive shaft, took it to dealer they replaced drive shaft, did not solve problem , so apparently they did not know how to solve problem and basically were grabbing at straws, I still have problem, front running lights keep burning out (electrical problem).