I,m rebuilding my trans, I have rebuilt turbo 350's and 400's before so I have no worries about doing the work but I don't know if I should replace the solenoids and wiring harness or not, the truck is slipping in 2nd gear but still makes all shifts and their is no falut codes in the computer thanks

 

If your doing a full rebuild, ALWAY replace the solenoids with NEW (not rebuilt) solenoids. Here's a couple of links I thought were useful when I did mine.
https://dodgeforum.com/forum/2nd-gen...nsmission.html