Posted: Sep 10 2009 at 5:19pm | IP Logged

Ideas:

1. Front diff pinion bearing and or pinion/ring gear issues.

2. Front diff axle bearings.

3. Front diff low on oil.

4. Wheel bearings that only act up under load.

5. Brake pads rubbing;caliper frozen (if whells turn freely, probably eliminate this).

6. Check trans for proper fluid level and condition.

Posted: Sep 12 2009 at 7:00pm | IP Logged

All the u joints seem to be on the same plane

Posted: Oct 17 2009 at 7:56pm | IP Logged

no they dont turn when i jack the truck up. This is driving me crazy..i replaced the rigght front wheel bearing and propeller shaft u-jionts this week and niether fixed this problem. I cant really afford to take it to a mechanic or the dealership..they charge 100's just to trouble shoot and then more for parts and labor. Thats why im trying so hard to track this down on my own. I did notice that when i jacked the truck up and turned the wheel that the brake pads were squeaking cause they in constant contact with the rotor. And I was told that the rotor on the same side needs replaced. Could this be causing the niose?

Posted: Oct 19 2009 at 7:31pm | IP Logged

Noise like this are sometimes a pain to locate and fix.  Many decades ago I had a new Pinto station wagon.  Made a clunking noise over bumps and pulling into the driveway.  I finall got under it and started at the back bumper, pulling, pushing and looking at everything on both sides as I moved forward.  To my surprise, Ford had not put any nuts on the bolts holding the leaf springs to the shckles and the bolts were about halfway worked out of their bore!!!!

So get under it, look, handle and think.  Eventually you'll find it!