I just got my ranger back from the shop where they replaced my sending module for 4x4, I had the truck out today and it performed just fine in 4x4 high when descending steep hills and going through mud but on my way out of the area I shifted into 4x4 low to climb the hill out and about mid way through the climb and the truck at about 3000rpm there was a loud clunk that sounded like it came from the front portion of the truck, I continued to climb thinking I had just scraped a rock but then it happened again. I came to a stop and shifted the truck into 2wd and it drove perfectly fine after that, what might this clunk be?? Does my flux capacitor need recalibration??? Lol

 

Who knows what the clunk may be.

If your out playing in the mud with your truck, you need to know how to repair it and diagnose it.

Wash off the mud from the underside of the truck and perform a visual inspection, then you can tell us what the noise was.