Just bought a 98 SHO with 154,000 miles and have gotten it running but maybe matter what I do it will not shift to 4th gear. No slipping or anything, just won’t shift. Here are the series of events that I went through: 1. New trans fluid and filter. There was not any metal in the bottom of the pan or anything. still no 4th gear shift. 2. Gave me the P0761 code for solenoid 3 not working. I then went it and replaced the solenoid, forward control valve, and entire valve body. Still no shift to 4th. I will experience the speedometer to drop a few mph occasionally but there’s no ABS light or anything so I don’t think that is contributing. My next theory is to check wiring to the transmission and if no avail I will just have to pull it out and go from there. Any tips?? Any help would be greatly appreciated!