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Originally Posted by barry123400
Since it always had the vibration from the day you purchased the car it does change things a little. Someone in the past may not have indexed the driveshafts properly when replacing the centre carrier or bearing. Or one of the shafts may even be bent.To prove imbalance you might want to put two screw clamps on the driveshaft and rotate them to different positions to see if vibration is reduced or perhaps get another intact shaft from a salvage car if cheap enough. First again though you want to critically check centre universal and rubber end disks etc. You can check for bent shaft on car though quite easily. Shame to have to pay the bucks out to have the shaft balance checked. As problem did not develop in your possesion it may be required. Know it bugs you as you mentioned you had a dynamic balance of all wheels done already to try to eliminate the problem.  |
If the shaft(s) were bent, wouldn't it do it at the same RPM in each gear?
Or is it because it hits the driveshafts critical speed in 4th (1:1) that it will vibrate at lets say 3000rpm that it'd have to do it at ~4400rpm in 3rd (1.44:1) to do the same thing?
This car, aside from oil changes, was pretty much never taken care of. Paint sucks, interior is shot, brakes have new pads thanks to me now, etc. Most stuff needs to be rebuilt so chances of stuff being OEM are pretty good that most have never been touched or removed from below.
