Shift solenoid location

Hi everyone thanks for any help you can give me.

1998 Jeep Cherokee Loredo Automatic 6cyl

I washed my Jeep the other night and even the motor real good. The next morning I went to drive it it would shift nicely the first 3 gears BUt will not shift beyond that like it is stuck in over drive. Someone mentioned to check the shift solenoid but I have no idea where it is locate.

Any help is greatly appriciated

Ken