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The other thing that we noticed was that half way through the trip after climbing a hill the truck did not shift back down through the gears from second to fourth until I stopped the truck and shifted through the gears neutral, drive, first and second. We had several other incidents on flat ground where the truck shifted down for no reason then remained in the lower gear long after it should have shifted.
I have since rechecked the automatic transmission oil level and discovered it to be slightly over the full mark when at an idle. I removed some until it was at the correct level. It now seems to shift correctly except after driving it for awhile, then on flat ground or on slight rises, it will down shift occasionally then be reluctant to shift back up to fourth.
Thanks for any comments or suggestions