Re: 06 not engaging drive (mark)
You can try changing solenoid E (low/reverse solenoid). It could be mechanically sticking. That is easier to change than the line pressure solenoid (solenoid body must be removed to change PC-A). If you change both with no improvement you may have sticky valves in the pump itself. My personal truck was like this. The main line pressure valve did not want to come out of the pump. Very sticky.
07 CCSB 4x4 Lariat FX4 Bronze Metallic/Sage
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