Hey all.

You may remember I had my sons' car here, down for a month trying to figure out an unrelated problem. Fixed that one up and now we're seeing another. Figures, huh?

Anyway, here's our latest...

While driving normally (unspirited) the darned transmission doesn't want to upshift unless I completely back off the gas pedal.

A little history: I had the local transmission shop replace the rear main seal which had blown out due to a (now-cleared) plugged PVC system, and while they were in there already I had them flush the torque converter, transmission and clean the filter.

Which leads me to my question. What is it that directly controls the upshift? Is it engine vacuum? Electronic? Or is it something else?

No matter how gently I ease into the throttle, the darned tranny just won't upshift until I'm either taching out or as I'd said, back completely off the throttle.

Help! :)