4L60E lockup/4th shift all at once?
It's very annoying because it's a huge drop when it shifts from 3rd to 4th. It gives quite a lurch. I searched a bunch here, found lots of lockup threads but none that seem to address this. Any suggestions?
I'm new to Firebirds but I've owned a number of LT1 Impala SS/Roadmasters and never run into this before.
Thanks.


