Need help with my Impala losing forward gears except 1st, which creeps, and slips. Reverse is fine. 150,000 miles on original maintained transmission. fluid is clean and full. Took off from stoplight heard a pop, and won't go forward in O/D,3,2. Been all over the internet and have not seen these symptoms in this 4T65-E trans. All I see is shift solenoid problems. PLEASE HELP. Thanks.