automatic transmission wont go into overdrive on 1996 Dodge Ram Van 1500

did all the changed filter fluids all at rightlevels and it is a automatic overdrive no button

Asked by for the 1996 Dodge Ram Van 1500
replace the valve body
jim riehl friendly dodge, jeep and chrysler
over $1000.00 to have it done at the
dealership at $104.00 and hour labor
3 1/2 hours labor + parts