The solenoid pack is so far inside the transmission, you may as well just rebuild the entire transmission.
4T45e's are pretty cheap to buy used. I picked up mine out of a 2003 Grand Am GT for $265. Since I have the HPTuners, I was able to reprogram for the 3.29 FDR, since all the Alero V6's came with 3.05 FDR's
Don't know if you want CJ to have that or not. It really doesn't make that much of a difference though
33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12