Replace your output speed sensor while you are under there , the one that screws into the driver side lower part of the rear extension housing. you wouldn't believe how many issues that can cause with pressure readings
70 cuda 440 6bbl Auto with a dana 60 68 road runner QQ1 383 auto 1970 6 barrel 4 speed Superbird FY1 number matching 15 Challenger 6.4 SRT pearl White 6 Speed 72 Cuda 440 5 speed 71 Road Runner 440 4 speed