jgreg53 Posted December 12, 2021 Report Posted December 12, 2021 I changed shocks front and rear on my 1948 p15. Now I have some vibration in the drive shaft. Could the new shocks throw off the pinion angle enough to cause this? Quote
DJK Posted December 12, 2021 Report Posted December 12, 2021 Last I knew, shocks do not change ride height, only springs, shims change the angle. Back in the day, we would spin a driveshaft at speed while holding a piece of chalk to mark the high spot and install hose clamps with the screw opposite of the chalk mark to obtain proper balance. This was a Nissan factory fix. Quote
Bryan Posted December 12, 2021 Report Posted December 12, 2021 How did you jack up the car? Nothing slipped and bumped the drive shaft? Don't see how shocks could do that. No clumps of mud on it? Maybe you had a bad universal (trunnion) and somehow jacking the car up pulled it, but unlikely. Quote
Bryan Posted December 12, 2021 Report Posted December 12, 2021 15 minutes ago, DJK said: Last I knew, shocks do not change ride height, only springs, shims change the angle. Back in the day, we would spin a driveshaft at speed while holding a piece of chalk to mark the high spot and install hose clamps with the screw opposite of the chalk mark to obtain proper balance. This was a Nissan factory fix. As my 1992 Dodge Dakota? 1 Quote
jgreg53 Posted December 12, 2021 Author Report Posted December 12, 2021 I jacked it up on the frame and used jack stands. Quote
busycoupe Posted December 12, 2021 Report Posted December 12, 2021 My car had a vibraton from the driveshaft after I replaced the engine mounts. I took apart the trunion joints and found that they were in good shape, but were full of hardened grease. After cleaning and new lube they were fine and the vibration went away. Quote
jgreg53 Posted December 12, 2021 Author Report Posted December 12, 2021 Your idea about marking the shaft to find the high side looks interesting. Quote
Bryan Posted December 12, 2021 Report Posted December 12, 2021 3 minutes ago, jgreg53 said: Your idea about marking the shaft to find the high side looks interesting. The .03, .04 markings were me using a dial gauge after smoothing the area all the way round with fine sandpaper. Quote
soth122003 Posted December 12, 2021 Report Posted December 12, 2021 If you had the driveshaft out recently and didn't mark or index it on removal then you may have rotated it by 90 or 180 degrees and now you have a vibe. But I would check the fittings and make sure they a lube properly first. Joe Lee 1 Quote
Go Fleiter Posted December 13, 2021 Report Posted December 13, 2021 (edited) my drive shaft has heavy vibrations if front ist assembled on the rear! Since having experienced this, an arrow shows me the front! Edited December 13, 2021 by Go Fleiter Quote
Bryan Posted December 13, 2021 Report Posted December 13, 2021 17 minutes ago, Go Fleiter said: my drive shaft has heavy vibrations if front ist assembled on the rear! Since having experienced this, an arrow shows me the front! I was afraid of that so I marked it.. Quote
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