transmission shifting to early

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1982_Chevy_K10

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Eureka, Kansas
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Brandon
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1982
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k10
Engine Size
350
My transmission has been shifting to early for the past 8 months or so. It shifts from first to second at 25 but then shifts again between 25 and 30 and starts bogging down. it will only do that if i don't put my foot in it, if i give it like half throttle then it will shift where its supposed to, between 45 and 50. Do you guys have any answers as to why it does this, oh and its the turbo 350c.
 

yevgenievich

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There is a vacuum modulator on the side of the transmission. Check the vacuum line going to it.
 

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