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My 1989 Chevy Silverado K1500 will not engage into reverse. It engages in D, but not in R. Not even when I put it in 4x. All fluids are fine. Battery and starter have all been checked and are fine. Everything works except that it won't kick in when I put it in reverse even with the 4 wheel drive. I'm at a loss for what to do because I don't know what's going on.