Date registered: Mar 2009
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1984 300d advice needed, Halfshafts/cv joints
I recently purchased a 1984 300d, I am not so familiar with IRS so I was hoping to get a little advice about diagnosing a speed sensitive vibration issue.
I get a clunking and vibration that feels like it is coming from the rear end, mostly at freeway speeds but sometimes slower as well. The clunk and vibration are worse when I am accelerating or under heavier load. The problem appears to be worse when I am turning right, ie, when the left side suspension is loaded and the right side is unloaded.
The problem comes and goes. It gets worse when I am traveling South (yeah, I know...) or when I have driven about 100 miles, stopped for half an hour or so and then resume traveling. I have inspected the driveshaft and the flex couplings, universal joint and carrier bearing all appear to be fine. The CV boots are intact though a bit cracked. I pushed and pulled on the shafts, there is no play detectable but an interesting difference between the two sides: the right side slides in and out easily, with or without the weight of the car on it. The left side slides in and out when the car is up on jacks only. I pulled back the boot on the inside of the right side cv and the play is occurring on the diff side of the joint, which appears fine if a bit dry.
Does anyone have any advice about diagnosing this problem? Please email me off list firstname.lastname@example.org