Re: th400 second gear intermitent
First thing to check is the shifter and cable. Any slop at all change the cable. It may be going past or not quite getting to the right spot in the valve body every time.
Cables or sloppy linkage has caused more problems to not be a real issue.
Been there done that and felt stupid afterwards after pulling a trans 3 times taking it apart 3 times then fixed by changing the cable.
My 2 Cents
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