tranny wont shift into overdrive

i have a 1979 k5 blazer with a 350. just put motor bake together from a head gasket job. now the trans wont shift into overdrive. the trans fluid is new and full. any advice needed. thanx.

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jneighbors23
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79 K5 came with a turbo 350 automatic which is a three speed tranny.

Whitelightning

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Whitelightning

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