1990 Chevrolet S10 Blazer Q&A

1990 Chevrolet S10 Blazer Question: 700r4 not shifting into overdrive

actually an 89 but that was to old for the selection list but anyway i just changed the front seal due to a fluid leak all went as well as that could but now it doesn't shift into overdrive with any regularity please offer any advise that may help thank you -
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