John Searcy

Has anyone ever had any issues with the M Drive? He is my situation, we bought 2 2013's off of Iron Planet. We drove to Georgia to pick them up and only brought one back.

U could build air, push the yellow button in and while holding the brake put it in gear and move the truck. The next time u make a complete stop the truck would not move at all. U could mess with it buy building air and tapping the brake pedal and eventually get it to move and it would shift and fun perfect till u make a complete stop.

It seemed to me there was a connection between holding the brake pedal down to let the trans shift in at a complete stop. Im not sure if there is an airline that goes from the foot valve to the trans that was causing this issue. The air app. gauge was showing it was holding air somehow and not releasing to let the truck move. the truck would go in gear but the brakes would lock the truck down like u were holding the brakes as tight as u can.

The reason I ask about the trans is cause it only did this when u stop and make a gear selection and or just make a stop period. Trans shifts but the brakes are locked.

It rained in Atlanta for 3 hrs straight and when it quit the guys closed the doors to go home.

Under the shift selector inside the cab, disconnect the harness going to the shifter for 5 min. This will reset the TECU, but prior to that disconnect the positive and negative battery cables ((completely from the unit)) for 30 min, as this will reset/reboot the VECU and then do the shifter harness for 5 min. If there is a communication issue through the canbus line with these ECUs this processes should clear up the issues, if not head in to dealer for repair.

I installed a new clutch brake and could not get pedal adjustments to specks, then discovered the clutch cable that was formerly installed was a replacement cable build wrong from the original, and they disposed of the original. Does anyone know/have the correct clutch cable for a 1983 Mack , model WS788LST, vin 1M2Y15C3DM001630, I could purchase? Even an old one or used one that I could have copied? Also need a drivers side windshield and cannot find one. Any suggestions?

... I know who can get you exactly what you need. Call Mack One Call @ 800-866-1177 and ask for the phone number to the Mack Museum. They will be able to assist with locating any old parts.