you have a 48re in that and the trans temp sensor is part of the transducer inside the pan it could be going bad they give a lot of problems.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4