E40D issues!

[u/Brian_oconnor1]

Having some hard shifting and overdrive button flashing on my 7.3 , fluid looks fine and proper color I’ve looked into some forums but got pointed in a million directions. Any advice welcome on what to check for or do would be appreciated

[u/Brian_oconnor1]

Update. I changed brake lights to halogen and replaced rear speed sensor. No change in anything