400fanboy

My transmission has become intermittent in it's doing this interestingly enough. Some days it shifts pretty harshly and really slams the clutches. Some days it slurrs and slips it quite a lot. I think it depends on how you approach it. If you're barely creeping up on it with very low throttle, it will slam quite hard. But if you approach it rapidly it will be more generous.

And some days it doesn't even really do it at all, though this often happens if I drive very carefully up to where it will normally harshly shift... but don't actually go fast enough for it to trigger. I then come to a stop at my streets stop sign and repeat on the next couple of streets, never leaving 2nd gear. By the time I get on the main road it shifts normally, even though this is the middle of winter and the coolant probably isn't even above freezing yet.

So there seems to be situations where if you just spend enough time in the "high pressure" zone of higher RPM\speed that it will satisfy some condition and bypass the harsh shift. I dunno. It's very strange. I'd be curious to know from the transmission programming team who designed this box in the 90's why the quirk is there.