Quote:
Originally Posted by Formulajones
All my auto transmissions that are controlled with a vacuum modulator do that when I'm up at high elevations. Low vacuum signal to the vacuum modulator will cause a delayed shift, most noticeable on the 2-3. As soon as I drive back down to sea level it's back to normal.
Not sure what elevation you're dealing with but it's something to look at. Could just be a simple adjustment on the vacuum modulator (screw inside vacuum nipple) If someone was messing with yours there is no telling what they might have set it at.
When I adjust mine down to shift normally at high elevation, it causes very quick short shifts when I'm at sea level, so it's a balancing act. I just have to live with it one way or the other or find a happy middle spot that's good enough.
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What is hilarious is that
the huge, black-canister modulator assembly that everyone tosses in the trash in order to install a crappy, cheap aftermarket "adjustable" modulator...
is altitude compensated. They're also adjustable in most cases, provided you're careful about breaking the spot-weld on the adjustment screw.