Check the fluid. This always happens when the valve body isn't getting enough fluid pressure to change the fluid direction in the valve body to apply the pin for reverse, or engage the clutch packs for 1.
You say it happens every once in a while? How long do you let it sit in gear when this happens? Don't be imatient. Next time it happens let it sit there and time it with a stop watch. See if the length of time it takes to finally pop into gear gets longer and longer. If it does your clutch plates and apply band are shot.
What's the fluid look like?
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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