Anybody please - Solenoids or shift kit (or both)?

2001, 200k + miles. Delayed 1-2 shift and decent 3-4 shift. No 4th due to stripped 4th splines (I'm quite sure). After awhile it goes to hard shifts. No noticeable slipping. If I replace 4th hub myself, while it's open I'm thinking about replacing all the solenoids, definitely the PCS. If I do this, would a shift kit on top of new solenoids be beneficial? Help in any way or hurt?

Also, is there a go-to thread that outlines these procedures and the needed parts/gaskets?

Thanks!!!