A-904 Shifting from 1st to REVERSE!
The only clue I can think of is it only started doing the first to reverse shift after we'd adjusted the kick down linkage.
I test drove it for a couple of miles, kicking it from 2nd to 1st and 3rd to 2nd a few time.
Brought it back to the shop and talked with the owner a few minutes.
Got in it to drive to home and BAM! 1st to Reverse.
Did it twice, so I drove back to the shop in 1st.