TH350 Transmission in 79 Camaro?

Q: ok so i put a TH350 in my camaro and i take it down the street, picks up great and everything just cant get it to shift while its in drive. So what i'm thinking is maybe the kickdown cable is to tight and maybe thats why it wont come out of 1st i don't know any ideas??? And yes like i said picks up great full on fluid and everything

A: the vacum on the back of trans has to be connected to direct intake vacum port so it will have enough vacum to work properly..

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