3 4 lock up issue.
 

Hey all. First time posting. Need some help. Have the common 3 4 torque converter lock unlock issue. Have gone through tons of threads. Most address 04 and older. Trans has only 20,000ish miles since build. Have recently replaced pressure transducer. Upgraded bd. New bw gov solenoid. New tcc lock up/ overdrive solenoid. Gone through all cables and grounds. Several new or replaced ends. Removed alternator cables. To take it out of the equation. Going nuts. Any other thoughts. 2006 Megacab 4wheel drive.

A misadjusted brake light switch can cause it. Next time the condition starts occurring, lift up on the brake pedal with your left foot as you drive, and see if the condition goes away.

Never thought about that. I did replace it not to long ago but I will try it. Thank you