chrled

Hi,
I have a problem with my 79 with a 3 shifted auto trans. Sometimes when engine's hot the shifting stalls/slides sligtly when upshifting. Never happen down shifting or rarely when cold. Checked oil levels when hot everything seemed just fine.
Thanks - Chris, Miami

88'Cubka

So it shifts good when you just start the car and go, but when it heats up it doesn't like to upshift/upshifts roughly? Maybe you need a tranny cooler.

chrled

Thanks,
It does shift properly but it stalls a bit until the next shift jacks in. Sometimes it happens when cool but mor often when hot.
Chris

Alwyn678

Mine did that before I installed the Transgo shift improver kit and the hayden transy Cooler

88'Cubka

:withstupid:

Jvette73

Check for vacuum leak to modulator. Or the vacuum line may have come disconnected. Or it could be a bad modulator. Not to hard to fix at all. Hopefully its someting simple like this. Poor or no vacuum signal or bad modulator can cause slipping and delayed shifting problems.