Tranny issue

Joey1977

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I have a 99 Yukon. I recent change the tranny filter. My reason for doing this was when I would put my truck in gear it would drive for a quarter mile the slip out of gear. In order to drive again I would shut off the vehicle wait a few minutes then do it all over again.
After changing the filter at first, it would not go in gear. I let it run for a while as a friend suggested. I got in, recess the engine, and it fell rite into gear. It will not go in gear unless I rev the engine. This tells me I have a pressure issue but I’m no mechanic. Any thought?
 
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