Vibration while in gear and stoped solved by replacing front driveshaft flex disc

[Overboost]

Originally Posted by andrewwynn

Same reason that worn CV cause vibration or engine mounts. When engine is running and power train is engaged the individual hits of power load the system then briefly relax. When there is a worn part, the output shaft of the engine gets to twist things a little farther before the slop is removed.

Watch how much play is removed for example when a car is shifted from reverse to drive. It's the same play that is coming into action.

Often (likely always) when the guibo is the source it's loose bolts and you can punt on replacing by torquing them down.

The drive shafts are torsion springs and will store plenty of energy even at idle to push the transmission slightly backwards to loosen up the drive train ever so slightly to set up for the next power push and following jiggle.

Interesting Andrew. I would never have guessed that it could be a source of vibration. I have engine mounts planned soon now that I have an entire atmosphere under my car now up on the QJ so we will definitely find out if it is mounts or flex disc and axles. Thanks for the explanation

[andrewwynn]

Keep us posted what you find. I might be interested in some of those suspension parts that may have a few miles left in them


Sent from my iPhone using Tapatalk Pro