Fellow Posters,

I took the '83 CDT for a little road trip. My son uses it as his daily drive to and from school, short mileage. I figured it would be good for the engine, to stretch its legs so to speak. After about 60 miles a virbrating, poping sound develops coming from the rearend. The sound varys in intensity. I pull over at a rest stop for a few minutes. Nothing visible hanging or leaking. I proceed with my trip. No poping sounds for about another 60-70 miles. Then it starts again. I put the tranny into neutral and rev the engine to 3K, (this has been the approximate rpms while traveling), no vibration/poping sounds for the next several miles. I'm assuming this would rule out the muffler. I had to stop for fuel once, again no noises for the next 60 or so miles. My speed varied from 70-80, it seemed not to make a difference.
Any ideas?

Marks88

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'88 300 sold
'83 300cd