I'm a new member here. I have a ford ranger 3.0 v6 with auto trani. Yesterday I put it in reverse and drove 200 feet or so and heard a loud clank or knock sound. When I stoped I was in reverse but all it did was rev the engine. I put it back in drive then reverse worked. It still makes that sound seems to be coming from the rear end, maybe drive shaft. Anyway also before this happened my od light starts blinking when I drive more than 40 miles. I can turn the car off and back on and it stops. I replaced the sensor on the rear differential, I guess it's a speed sensor or abs sensor. Any ideas what's wrong? Am I looking at having to rebuild my trani? I just got done replacing my top end because my radiator busted and cracked my heads. I'm worried about the cost of this and is it okay to drive the truck. Thanks for any replies