4l60e problems
 

Ok so I have a 1994 GMC K2500 and its has the 4l60e in her. My problem is that she isn't shifting into 2nd going up or coming down. All other gears seem to be working fine. One is there a test that I can do to check and see if the solenoids are working properly and if so how can I tell which solenoid it would be?(referring to either the ones in the trans or the one with access on the outside of the trans) I don't know if it makes a difference but my truck has a 9 in lift on 38 x14.5 and has been reset as far as the speed-o-meter is concern. So that leads me to my next question. Could the PMC not been set for the transmission and just the speed and if so how can I tell? Thanks for any and all help?