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CV joint causing vibration on acceleration

13K views 4 replies 5 participants last post by  idosubaru  
#1 ·
Hello,

I had a torn passenger side inner boot when I bought my 2008 Outback 2.5i, I don't know how long the previous owner had been driving like this but there was no vibration when I got it.

I decided to reboot the axle, as it was the cheapest option. I removed the axle and cleaned the grease from the inner joint, used the new grease from the boot kit (aftermarket), reinstalled the axle and it worked good for a while.

5000km later, I'm getting a vibration on acceleration, especially when turning. Installing the FWD fuse, the vibration is much, much worse. It vibrates when going straight. That means it is a front CV joint.

Decided to pull the rebooted axle today, took it appart. For the inner CV joint, Subaru says you need to align trunnion, how do you do that? I could not find a mark on the bearings, they seemed rather stiff. Could the old grease have mixed with the new one and seized? The joint seemed really smooth in my hand, moving it around when I had it off. It also had very little play.

I guess my question is how do you tell an axle is bad when you have it off the car? Also, how like is it that my differential is bad? It is an automatic, the oil is at the correct level and doesn't seem dirty on the dipstick.

Thanks and sorry for the novel!
 
#5 ·
diffs usually have more noise than vibration and you've already had axle complications so diff is highly unlikey.

probably simpler to just get a used axle and be done with it, they're $15-$30 all over the place for OEM axles Car-Part.com--Used Auto Parts Market

make sure the joint is assembled properly. the round metal rings - the bearings i guess you might call them - i think they have a top and a bottom, they're very slightly different.

from experience i can tell you that if it wasn't vibrating before then it shouldn't be problematic now. i've rebooted plenty of inner joints that were already vibrating and they're all still running fine to this day as far as I know with no vibrations or noises. i would guess yours has failed, missing a clip, misailgned

you can swap parts from left and right since the axles are identical, because the loading and wear points are different (mirror inverted image so to speak) when you swap the cup from the right to the left. i've never done it but I know people who have and i haven't heard of it not working...but few people do it as well.