Transmission issues

[Sneaklylilpetey]

I've been getting a couple codes lately that come and go. I've noticed the trans hunting for 2nd and 3rd and sometimes you can hear it really clunk into gear. I've already replaced the transducer and ats pressure solenoid.
Should I replace the entire valve body or bite the bullet and drop the trans for a new one.
Trucks got 100k on stock trans

 

[Sneaklylilpetey]

Correction, it's not 2nd and 3rd. It's when I'm in 1st going into 2nd but keeping a slower speed, around 30-40mph. It will shift into 2nd for a bit then downshift into 1st. Then clunk upshift into 2nd

 

[BigPapa]

30-40mph is going to be 2nd to 3rd.

 

[cerberusiam]

It would help to know what equipment you are working on to start with.

P1750 is a TTVA code, it isn't reading what it wants after it tries to set. Could be a bad TTVA, could just a bad connection.

P0868 is a nuisance code, does not apply to a 48RE.

Both codes could be generated from a bad VB harness also.

 

[Sneaklylilpetey]

Just a little update on these issues. Turns out I was low transmission fluid. I didn't realize you should check these things with the truck running and in neutral .. Filled it up and no longer having any shifting or check engine lights.
I also disconnected all the electrical plugs under the hood and at the transmission, then sprayed them with electrical cleaner. I also went over all grounds to make sure they had a solid connection. Fingers crossed but so far so good