I was trying to pull a friends stuck bronco out of a mud hole today. When I had the truck in four hi and took the slack up in the chain the didnt even go. Didnt spin the tires or anything. But when I put it in four low it finally moved and spun all four. Didnt get the bronco out(stuck halfway up the wheels in mud and I was in wet grass and mud. Could this be my kickdown linkage again doing this. Or is there something with my carberator or drive train. I was in first on my automatic trans I even tried drive and it did the same thing. Any help with this will be appreciated. Certainly has me stumped.