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I am kinda going threw the same thing the only dif is mine is two wheel drive and it shifts good when it shifts, it acts like it has a vacume leak when it doesn't shift because you push 5500 rpm and it will shift. 1st and 2nd shift fine but third and overdrive are a diffrent story.

my 1999 tahoe just started acting up onme it has 190000 miles but was running great then last night it acted like it had a vacume leak going from 2 to 3 push it up to 5000 rpm and it shift then going up a hill it would shift fine fluid level is perfect just did a t-tech probly 300 miles ago not...