Shift on the fly 4 wheel drive


i have a 99 chevy blazer zr2 4 wheel drive,when i try to shift to 4 wheel,sometimes it works fine,other times the 4 wheel indicator light just flashes and it won’t go into 4 wheel. what could be causing this?


Have you checked your shift linkage?


I assume you have auto hubs…I would check their 2 nd. They may not be engaging.


Don’t shift on the fly unless you are going below thirty. Go slower than that.