OK, simple tranny question:
At WOT(Wide Open Throttle), where engine vacuum is at 0" hg, what effect, if any, does a Vacuum Modulator have on transmission upshifting?
Specifically for the 440-T4(4T60)'s, which have 3 things that help determine shifting(TV Cable, Modulator, Governor), what determines shifting quality once the engine is at or near ZERO VACUUM?
I "think" it has to be just the Governor, but not sure?
THANKS!:)