Shifting issue only work in reverse?

No codes and gears you can feel when it catches reverse but when going into drive or other slides right through easily but it does seem to work when using manual gear. Every now and then it would catch in drive but takes off really slow trying to check transmission control solenoid which I believe is same thing as a shift solenoid but when looking doesn't seek to have its own solenoid or something no overheating no noises shuddering only time makes loud pop noise is when engaging in manual and when taking off but after that drives okay. Changed fluid not sure how to check if it's converter.

Having issues with gear not going into drive only hear seems to work in is fine you can when changed into rev but when going into drive slides right through when I also change and got into manual gear takes a while to get going but does seem to work checked linkage changed trans fluid and not sure how to change the shift control solenoid it's a 6l90 engine made in 8/2016 Chevy Silverado 2500 hd 4wd

Okay, so, apparently the linkage was not connected but now it engages in all gears finally perfectly fine but when driving doesn't seem to want to pick up last gear what should I do now.

Would doing a fast relearn help?

Sorry for video being hard to see we live on a ranch so we're driving on river rock which makes it so bumpy.

But notice how when shifting RPMs goes up where I'm having issues as to why and what to check.

Yes put new filter and person that I had come look at it did say it valve body might adjusting if not mistaken he said.

Okay, now living on ranch and it's all diet road as you can see bumpy to the fact that we haven't been able to push on the gas like we would on highway. Would that make a difference because mechanic did a reprogramming on computer? Just a thought.

Another question is, I'm not sure if there is sound on video, hopefully, but can you hear the squeaking when going over rocks which is everywhere so you can hear it all the time but not sure what bushings they'd would be.

Okay, what are the chances of the valve body getting messed up from a fire? We got stuck in sand and when they were trying to get it out of sand guessing muffler got too hot started a fire underneath truck, it eventually turned itself off. I looked underneath not too many signs of things being melted, but now truck will go drive when in changed over to manual gear. When out of manual gear and in drive will go for a bit but then speedometer revs up and that's when I need to shift into manually gear and will continue to go do I need a whole new transmission or just get a new valve body zip kit?