...usually when dead cold I'm either in a mellow mood and drive slow, or grumpy and rap it hard coming out of the neighborhood. Today I was in neither mood, accelerated just moderately and suddenly at about 18 MPH or so the car goes "VROOMP! (jerk) VROOMP!!" :mad: :mad: I'm thinking that was a faulty 1/2 shift...yes?

Your marks at the 100k so most likely all u need is the trany flush. Mine needed it at 108k I had the 45 rumble and the other symptoms are the 1-2 jerk u have exsperenced. Get a flush make sure they do it right and drop the pan use mercon v only ,try synthetic if u can, prob fix your prob sure as hell fixed mine, good luck.

ya sounds like 1-2 sping , My wifes Mark needs it done.... at WOT it will break them loose from 1st to 2nd. this is no little cherp !

Yep....sounds like mine too. I'm starting to sense it hits second too hard and in this case it "popped" back and forth twice....not healthy as it could stick in both gears and blow the trans.