i have a 1999 f250 with the 5.4 triton. the abs light came on and the spedometer stopped working until i reach about 35 mph. after i hit 35 it works fine. it also started shifting very hard into second gear. it only shifts hard when the spedometer is not working. if i get on it hard enough for the spedometer to start working in first gear, it shifts fine. any help would be appreciated.

 

Speed sensor on top of the differential.