Vibrations remain

[Kenneth G Zinis]

Jeep suddenly has vibration ~50MPH and above. Never had issue like this in five years. 85k miles.
New front U-joint and transfer case skid plate spacers (1/8" washers) is only recent change. Guy said washers help reduce rust formation.
I marked DS for alignment with yokes, they're OK on both ends, everything is torqued and centered.
Nothing apparent with tires, no bulges, lugs tight, no missing wheel weights.
Apparent whether in gear or neutral. Not especially apparent in steering, shifter or TC lever. Feel in whole Jeep, like it's a consistently bumpy road

UPDATE Removed skid spacers, retorqued skid, trans mount and u-bolts on u-joints, examined tires carefully, no meaningful change. I'll try rotating tires then remove front DS. Really seems like a tire issue, maybe a broken belt.

UPDATE- Rebuilt front DS with new DC and checked and found rear DS joints all good. Drove without front DS then later without rear DS, vibration still there.
Found a little play in front wheel bearing replaced with Spicer, vibration remains.
Had wheels rebalanced, 3 needed weights but only ~1.5 ozs. at most tech said no sign of broken belts, tires look true
Ball joints look fine as does steering linkage.

Front upper control arm bushing looks a little soft on R side, appears very slight. Also, axle U-joint on R side has very slight play. Could these be cause?

Running out of ideas

Thoughts to share?


Thanks

 

[eastbloc]

How is engine running? Some say they had vibes from engine misfire.

 

[MikeE024]

Jeep suddenly has vibration ~50MPH and above. Never had issue like this in five years. 85k miles.
New front U-joint and transfer case skid plate spacers (1/8" washers) is only recent change. Guy said washers help reduce rust formation.
I marked DS for alignment with yokes, they're OK on both ends, everything is torqued and centered.
Nothing apparent with tires, no bulges, lugs tight, no missing wheel weights.
Apparent whether in gear or neutral. Not especially apparent in steering, shifter or TC lever. Feel in whole Jeep, like it's a consistently bumpy road

UPDATE Removed skid spacers, retorqued skid, trans mount and u-bolts on u-joints, examined tires carefully, no meaningful change. I'll try rotating tires then remove front DS. Really seems like a tire issue, maybe a broken belt.

UPDATE- Rebuilt front DS with new DC and checked and found rear DS joints all good. Drove without front DS then later without rear DS, vibration still there.
Found a little play in front wheel bearing replaced with Spicer, vibration remains.
Had wheels rebalanced, 3 needed weights but only ~1.5 ozs. at most tech said no sign of broken belts, tires look true
Ball joints look fine as does steering linkage.

Front upper control arm bushing looks a little soft on R side, appears very slight. Also, axle U-joint on R side has very slight play. Could these be cause?

Running out of ideas

Thoughts to share?


Thanks

Do you have a Jeep friend with wheels & tires you can swap with to ensure it's not the tires?

Front trackbar are other steering parts are nice and tight?

Any play in the pitman arm?

I'd change the wheel hub if it's not tight like it should be.

Assuming the engine is running as it should (spark plugs/injectors, etc. all doing their job), how are your Motor mounts and Transmission mount? Are those parts Mopar and properly tightened? Edit: My first Jeep had loose bolts at the transmission mount when I purchased it.

Alternator/battery connections are tight with no damage or corrosion?

 

[JMT]

Jeep suddenly has vibration ~50MPH and above. Never had issue like this in five years. 85k miles.
New front U-joint and transfer case skid plate spacers (1/8" washers) is only recent change. Guy said washers help reduce rust formation.
I marked DS for alignment with yokes, they're OK on both ends, everything is torqued and centered.
Nothing apparent with tires, no bulges, lugs tight, no missing wheel weights.
Apparent whether in gear or neutral. Not especially apparent in steering, shifter or TC lever. Feel in whole Jeep, like it's a consistently bumpy road

UPDATE Removed skid spacers, retorqued skid, trans mount and u-bolts on u-joints, examined tires carefully, no meaningful change. I'll try rotating tires then remove front DS. Really seems like a tire issue, maybe a broken belt.

UPDATE- Rebuilt front DS with new DC and checked and found rear DS joints all good. Drove without front DS then later without rear DS, vibration still there.
Found a little play in front wheel bearing replaced with Spicer, vibration remains.
Had wheels rebalanced, 3 needed weights but only ~1.5 ozs. at most tech said no sign of broken belts, tires look true
Ball joints look fine as does steering linkage.

Front upper control arm bushing looks a little soft on R side, appears very slight. Also, axle U-joint on R side has very slight play. Could these be cause?

Running out of ideas

Thoughts to share?


Thanks

What kind of vibrations?

Do they increase with speed or stay constant once you hit 50mph?
Do the tires shimmy?
Does it stop at a certain speed or is this occurring only in a range of speed (e.g. 50-60mph)?
Is it while driving around a curve or also when going straight?
What is your tire pressure?

 

[Kenneth G Zinis]

How is engine running? Some say they had vibes from engine misfire.

Good thought. Engine seems fine, pretty sure I feel vibration even when rolling in neutral/clutch in

 

[Kenneth G Zinis]

Do you have a Jeep friend with wheels & tires you can swap with to ensure it's not the tires?

Front trackbar are other steering parts are nice and tight?

Any play in the pitman arm?

I'd change the wheel hub if it's not tight like it should be.

Assuming the engine is running as it should (spark plugs/injectors, etc. all doing their job), how are your Motor mounts and Transmission mount? Are those parts Mopar and properly tightened? Edit: My first Jeep had loose bolts at the transmission mount when I purchased it.

Alternator/battery connections are tight with no damage or corrosion?

I just had shop look at/rebalance tires/wheels, no issues other than slight rebalance needed.
Trackbar and other steering parts seem fine, pitman arm is new two years ago.
Yes, wheel hub replaced.
Engine runs fine, engine and trans mounts seem OK, all bolted tight.
I'll check alternator mount

 

[Kenneth G Zinis]

What kind of vibrations?

Do they increase with speed or stay constant once you hit 50mph?
Do the tires shimmy?
Does it stop at a certain speed or is this occurring only in a range of speed (e.g. 50-60mph)?
Is it while driving around a curve or also when going straight?
What is your tire pressure?

Vibes are through entire vehicle, not felt in steering, shifter, TC shifter or brake pedal
No shimmy in steering
Seems to begin @ 40-45, noticeable @ 50 and above, faster=more vibes
Straights and curves seem the same
24 PSI cold, 33x12.5x15s, Pro Comp ATs ~9k miles