4R70W Overdrive Server Info Needed

[marvinmycat]

For the TransGo shift kit, it recomends replacing the Overdrive Servo in the vavlebody with the stronger "A" servo. I believe my 98 3.8L AODE has the "C" servo which is crap. Does anyone have the part number for it as it is not listed in my Chilton's and the dealership is thoroughly confused after talking to me?

Thanks!