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Won’t go in reverse….. Long story so here it goes….. I have a 2006 Chevrolet Silverado Crew Cab 4x4 (5.3l / Auto transmission / electronic 4x4 – Auto, 2wd, 4L, 4H) with 120k miles. I’m driving my truck (2wd mode) and I pull up to my house, get out and go inside with the truck still running. I get back in my truck and put in reverse and it’s like my truck is in neutral. I put it back in park, then back to reverse, I hear a grinding noise, but again it acts like it’s still in neutral. I speak with a couple mechanics thinking I have a transmission problem. Sure enough unanimous everyone is pointing to the transmission. I take it to a reputable tranny guy and he says most likely the shell is broke. He drops the tranny pulls it apart…. Says there’s minimal wear, no broke shell, but rebuilds it anyway since he has it apart. After the tranny is rebuilt he too cannot get the truck in reverse (2wd mode), so basically at this point I’m $1100 in the hole and still have the problem. He plays around and put the truck in “Auto mode” and suddenly the reverse starts working… all is good. He recommends the issue being a broke tooth in the transfer case…. Says its terminal but all fluids were full in the TC, etc….. While in Auto mode I have the need to drive through a ditch… thinking I will get stuck… I feel the 4wd lock in and I drive right through it. Fast forward since… I’ve drove on the beach 2 times in Auto mode (loose sand not Daytona) and both times the 4wd locked in and drove without issues. I’ve been driving in auto mode for about 2 months. I take it to a mechanic today and he replaces the 4wd electronic switch with no luck. He tries to read the code but for some reason there’s no power to my code cord?? He’s now leaning to a computer issue or the actuator motors….. ANY HELP WOULD BE GREATLY APPRECIATED!!!!!