1994 SAAB 900 Repair Question
Worn spots in the roller surfaces of the inner cv joints cause those rollers to bind when they're trying to change the length and angle of the shaft as it rotates. That forces the shaft to push on the spindle which tugs on the lower control arm. That binding is most noticeable under load, (accelerating), and much less noticeable during cruising or coasting.
Replacing the entire half shaft is usually less expensive than buying just the inner cv joint housing from the dealer. There is always a chance though that you might get one with the same problem. That's because it's not common enough that the rebuilder checks for that wear. It can be easy to miss too.
The only other way to know for sure if that wear exists is to disassemble the joint and inspect the housing. If you can feel the slightest irregularity in the rolling surfaces, you REALLY got junk. If they feel perfectly smooth, then you have to shine a light in them and look at the reflection. The slightest imperfection will show up as a wave in the reflection, and that is enough to cause a problem.
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ALSO NOTE THAT SOME PEOPLE CHANGE TIRES THINKING THAT COULD BE THE CAUSE AND THEY ARE RIGHT BUTTTTT THEY CHANGE TIRE PUT CHEAP TIRES ON THAT HAVE ROAD FORCE ISSUES ,TIRES MAY BALANCE OUT PERFECTLY BUT FAIL ROAD FORCE TESTING CAUSING VERY HEAVY VIBRATIONS WHILE DRIVING ,SO I RECOMMEND GETTING YOUR WHEELS ROAD FORCE BALANCED ,TIRE SHOPS WILL KNOW WHAT TO DO WHEN YOU TELL THEM TO ROAD FORCE BALANCE WHEELS,I HAD THE SAME ISSUE WITH A 900 JUST LIKE THAT WHICH TURNED OUT AFTER REPLACING AXLES TO BE BRAND NEW TIRES BEEN FAULTY ,GOOD LUCK.
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