That does sound like a lack of pressure...
There were some valve body issues with the early 4T60-E'd...I'll bet a rebuild would correct for that issue... At 204K it may be time
If you are sitting still and you have the slector in D, and nothing happens... With you left foot on the brake all the way to the floor.... If you were to rev it a tad like 1500 rpms or so, will the trans engage?
I still agree with Bill tho... Almost sounds like the Pump is going
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