The other day I was driving along and started hearing a sound from the read. It almost sounded like a hoe-ram, if you know what that is. When I checked it out I found that once per revolution of the rear wheel there was a thump. Each time it happened the valve stem was in the same position. I bounced up and down on the back end and it would quit for a minute. It seemed to be worse under a load. Seems like since it is once per revolution the problem would have to be between the differential and the ground, not in the differential. Or am I just being hopeful. I replaced the half shafts 2 years ago.

Thanks

__________________
1980 300d on veggie

belt seperation on a tire??

how do they look? maybe jack up the rear, spin the tire and watch for out of round. it helps to use a block of wood, hammer, etc resting very near the tire as a reference point.

Did you look at the halfshaft boots??

__________________
1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Sounds like your are on the right track and will find what is the cause soon. But, I wouldn’t discount the idea that one of the half shafts has gone bad; even if the boots are in good condition..

__________________
84 300D, 82 Volvo 244Gl Diesel

If the sound was the half shaft or CV axle, it may happen random, and come and go, but over time more consistent. Sound should be in rhythm with the speed of the tires, until you take you foot off the go pedal. Mine usually stopped or almost stopped making the noise when I came off the pedal, and it was the CV axle....

__________________
85 300CD Turbo "Das Polluter" 230K sold for $3,000

98 BMW 323is