I pulled a 79 suburban 454 and put it into my nova. As stock, it had a vacuum line coming from the transmission up to the intake menifold and was hooked up to some soprt of source there. Since I have just replaced the intake and carb (no longer have any vacuum source, dominator carb) the transmission wont shift gears unless i nearly floor it and get higher up in the rpm range.

Could this have something to do with that vacuum line, and what is it anyway? I checked the tranny fluid and filled it, same problem. No idea!