Would have a dealer check it out or a actual transmission place that deals with these not just a general one. They will all claim “no problem” bring it in.
call a couple diesel shops in your area and ask if they have any recommendations on a transmission shop for a 68
It’s going into limp mode based off the 4th and no shifting when you turn it off it restarts it and thinks it’s ok. It should be setting a DTC when it’s going into limp mode and that can be a direction to look. Solenoid. Gear ratio error. Line pressure etc
yes the valve bodies are an issue with them. Doesn’t matter the year they wear the bores. I put a new one in on any of them I rebuild
with no DTC can’t really even guess what it could be
