transmission shifting to early

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1982_Chevy_K10

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Location
Eureka, Kansas
First Name
Brandon
Truck Year
1982
Truck Model
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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Location
Texas
First Name
Viktor
Truck Year
sad
Truck Model
very sad
Engine Size
less sad
There is a vacuum modulator on the side of the transmission. Check the vacuum line going to it.
 

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