I keep having to reset my tccm. can get it to go in 4wheel low and back out... then I need to reset by pulling the tccm fuse for a few minutes and cycling the switch 5 times... help

 

Have a look here:

https://blazerforum.com/forum/tech-a...e-first-30093/

Look for the Transmission and Transfer case section. Look for NV233 transfer case.
My write-up and the additional information from Swartlkk is a good primer.
https://blazerforum.com/forum/tech-a...-switch-29170/

This covers nearly all there is to know.