overdrive ? on the 4L60E
#2
over-drive
you have over-drive then torque converter lock-up which almost has the feeling of going into a fifth gear. the lockup can be set to occur at what mph you want it to
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The 4L60E is a torque converter lock-up transmission, that will lock the torque converter; also for better fuel economy. That is sometimes misinterpreted as a "shift" when it is actually still in the same gear you just see the rpms drop and the car jolt when the clutch locks up (similar in a way to the clutch on a manual car).
Transmission tuning can change these variables, as well as transmission modification, or adding a higher stall torque converter.