First, the trans doesn't use a vacuum modulator. Much older vehicles did. As far as the speed control deactivation device, it wouldn't cause the problem. However, it can cause a fire (while the car is off and parked in the garage) so I recommend having that taken care of ASAP. The 4wd actuator wouldn't cause it either. It is only activated when you require 4wd.
Now, is the trans full? Is the fluid clean? Have you had it serviced?
Let me know.
Wednesday, February 24th, 2010 AT 1:45 PM