Well, it is not a drain back problem. Now there is NO reverse when trans is hot. This problem went from a delayed engage when cold to no engage in reverse in 5 or 6 short trips and one 5 mile trip. All forward gears still fine after 5 seconds after cold start. Right now it looks like plan C (rebuild) is the plan. Will decide first of the week.
Paul

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84 500 SEL (307,xxx miles)