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I got to drive my 78 nova today with the 454 and th350 for the first time:D. I only took her around the block a few times and I notice it wont shift out of 1st gear when in drive. But if I put down in 1st and manually shift the transmission. it will shift threw the gears even go into 3rd at a very low speed. the transmission its self brand new.
 

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Check the vacuum hose that goes from the modulator on the trans to either the carb or a threaded port at the back of the intake.
 
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