1996 Ford Econoline Commercial Cutaway - Rough shifts

1996 Ford VAN CUTAWAY
BANTAM COLLONS SHORT SCHOOL BUS BODY
E350 DIESEL
40D TRANSMISSION AUTOMATIC

Rough shifting and overdrive light blinking.
Trans was checked, by specialist , is perfect.
computer diagnosis shows speed sensor module error, has been changed, computer reseted.
Problem persist.
Very rough shifting at low speeds when stops ate required…

You need a better transmission specialist.

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