94 merucry sable cruise control and tranny problems

I just had a new trans. installed, but when car is cold, cruise control,and transmition work fine; but after engine warms, cruise control stops working, and transmition doesn't shift right. And i was wandering if you had any sugestions. (in my opinion, it seems like a vacuum problem)
Thanks ,
Kevin

I just had a new trans. installed, but when car is cold, cruise control,and transmition work fine; but after engine warms, cruise control stops working, and transmition doesn't shift right. And i was wandering if you had any sugestions. (in my opinion, it seems like a vacuum problem)
Thanks ,
Kevin

First thing I would check is the vehicle speed sensor. On that car it's located in the right side output shaft of the transmission. Black with 2 wires plugged into.