Automatic Transmission Question....

i have a 95 jetta gl with cnk auto transmission and i changed the transmission, i put i a 94 cnk auto tranny....it works fine but when it hits like 40-50 mph and shifts gears its kind of rough...some people tell me that i need to reprogram the codes and some the i need to change the transmission sensor.....please help me????

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gdogg619
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