well, i drive in the city all the time so it's always stop and go. and on the interstate if i tap my brakes after being in 4th (aka overdrive), its always in 3rd when i get back on the gas.

of it's "avoiding" going into 4th, its most likely because it CANT go into 4th as we have said. i still say 4th gear is gone.

the whole shift lock problem is just a solenoid i believe.