avo

i have an envoy 2003 with a 6-cylinder engine and 4l60E trasmission, i rebuilt the transmission 4 months ago, after 2 months i had a problem with the generator(alternator) so i was obliged to jump the car for few times, after i repaired the generator, the car was in limph mode and the shift A solenoid was damaged. i repaired it. 1 month later the transmission pump was broken, i repaired it also. and now i have a delay during the shifts from 2nd to 3rd and a little of slipping, i replaced the solenoids after 15 minutes the solenoids are damaged again, and the problem has returned. someone has told me i need a new transmission. can anyone help me with this problem? is it an electrical problem? or it's the transmission? how i can solve it? it's been 4 months i have problem with this transmission.