Mike,
You can test it yourself with a long enough gauge. Basically, you need to determine line pressures at idle, in gear, and so on.
As far as no filter, nope, don't do it. It will pull anything into the VB if it's there. A new filter isn't causing the issue.
The idea of a wiring issue can certainly be a problem. If you have one that is not making good contact, it could be causing the erratic shift. When you had it apart, did you inspect connections and wiring?
Let me know. Also, let me know if this is the original transmission.
Take care,
Joe
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Tuesday, February 8th, 2022 AT 2:26 PM