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Hi you've tried to help before. My 2000 small block Chevy Blazer will not go into 4wd. Lights on dash don't change. I've changed vacuum hose but no luck.....any ideas. Never had a problem of any kind was running fine in 4wd now won't engage. No back country running just around the farm...October 16
thecardoc3Can you pull codes? Common failures are with the encoder motor, the shifter shaft that the motor drives and the control module, so you don't want to try to guess.