a/t Transmission shifting

[asidpara]

I have 87 Broncoll. It has a flat spot at 25 MPH speed. The transfer to the next gear is rough unless I slow down. I have changed oil, filter, vacuum module. Any suggestion?

 

[kimcrwbr1]

replace the vacuum lines to the shift module may be a cracked hose

 

[4.0B2]

agreed.. check vacuum lines.
also check the vehicle speed sensor. Take it out, check the plastic gear on the sensor and in the t/case