I have a ‘03 Silverado 1500 2wd. Lost 4th gear and CEL illuminated. PCM threw three codes: P0753and P0758and P0756. I replaced shift sensors 1-2 and 3-4. Worked great for exactly 7 days. Yesterday I felt a miss going into 2nd gear then I lost 4th gear again. Symptoms are now much worse than b4. Very sluggish start and no 4 th gear. I also. Noticed too much tranny fluid when I initially checked and siphoned about a pint out. Seemed to help, but symptoms persisted. Is my tranny about to go or should I change the up shift Sensors as well?