Vibration under power, no vibration when coasting
Last winter vibration started on totally stock KJ. It occurs when over aprox 38 mph and only under throttle, let off the throttle, no vibration.
It seems to be getting worse over time and I'm going to deal with it now that I have some time, but need some help with troubleshooting. I've read a lot of postings on here about vibration causes and feel it probably is drivetrain related.
I plan to:
1) jack vehicle up and put in drive, check for any obvious causes,
CV joint, driveshafts, etc
2) if nothing obvious, plan to pull rear driveshaft and drive with it disconnected, see if thats it, if not try front driveshaft
do these seem like reasonable steps ?
appreciate any suggestions on what to look for, how to pinpoint cause, etc
This is a 02 V6 4wd Liberty Sport with aprox 118k miles
Does the fact that vibration occurs under power and never when coasting
rule out non driveline causes like wheels, tires, front end issues, etc
had a friend say it was balljoints or wheelbearings, but I can't picture how
it would cause vibration only when your putting in throttle ?
vibration can be felt in wheel, seat, heard in dash, etc almost sounds like
a harmomic hum when throttle is added , even lightly
appreciate any insight on possible causes, and especially troubleshooting steps