1978 301 2bbl auto trans wont go into reverse unlexx reved high and wont shift up into normal drive gear regardles of rpm

Asked by Feb 19, 2013 at 08:03 PM about the 1978 Pontiac Grand Prix

Question type: Maintenance & Repair

4 Answers

sounds like you need to take a look at shift linkage from carb to kickdown. Is it still there? It is out of whack at least 1/4"--

1 of 1 people found this helpful.

I was told by a few it could be a vaccume leak goig to the trans, do they have any sort of vaccume controlled componate that assist in changing gears or hydrolic pressur in the trans??? Had it since 1984 but been in storage since 1996.

....no, not the VACUUM MODULATOR???

21,265

yes modulator, controls pressure,pull the hose and suck on it, should be springey,no leaks and a good vac. hose!

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