2000 CHEVROLET C/K PICKUPS Power Trainautomatic Transmission Problems

1ST.- PROBLEM WITH BRAKE BOOSTER, CAUSING A MAJOR VACCUM LEAK CAUSING VEHICLE TO SURGE AND STALL WHEN ACCLERATING ON TAKE-OFF. EVENTUALLY ENGINE WOULD CUT-OFF. AFTER A LOT OF EFFORT, DEALER REPAIRED THAT PROBLEM. 2ND.- 3/4 TON TRUCK, HD TOWING PACKAGE, EVERYTHING SUPPOSED TO BE HEAVY DUTY ACCORDING TO SALESPERSON AND STICKER IN WINDOW. BRAKE PADS ON FRONT ARE FOR A 1/2 TON, LIGHT DUTY TRUCK.VEHICLE DOES NOT STOP VERY WELL, AT TIMES, BRAKE PEDAL GOES TO FLOOR WITH LITTLE STOPPING EFFECT. DEALER WAS NOTIFIED DURING 1ST. PROBLEM ENCOUNTER. DEALER MADE NO EFFORT TO EXPLAIN OR CORRECT PROBLEM. PROBLEM STILL EXIST. 3RD.- TRANSMISSION MALFUNCTIONIONG. I HAVE HAD TWO TRANSMISSION REPAIR SHOPS INSPECT VEHICLE, BOTH SAID THAT PROBLEM WAS COMMON WITH GM TRUCKS. VEHICLE HAS BEEN PLAGUED WITH ONE PROBLEM AFTER THE OTHER. DEALER HAS BEEN NOTIFIED SEVERAL TIMES, EVEN BY CERTIFIED MAIL. GM, OR AT LEAST IT'S DEALERS NEGLECTED TO NOTIFIY...