Yes, Timbren Kit GMRCK15S will work on a 2005 2 wheel drive Chevy Silverado 1500 4 door crew cab. Timbren Kit GMRCK15S is designed to sit about 1" above your axle when you are not loaded, so it does not effect your ride. When you connect your trailer the overload spring will come into contact with your axle and prevent your truck from sagging.