Vibration after gear install

[gearhead22]

I recently had revolution 5.13’s installed in my 21 rubicon gladiator. I’ve now reached the break in point where I’m doing 70mph on the highway. At 65 it’s as smooth as could be, but when I get up to 70 I can feel vibration in the floor of the jeep that definitely wasn’t there before. It’s not horrible but is concerning because it was as smooth as could be prior. If I shift to neutral quick the vibration remains as long as speed remains constant so I don’t believe it’s load dependent. Obviously the driveshaft is turning a bit faster now so I’m wondering if maybe it needs balancing, but I can’t imagine it would be that much different from before? Any other thoughts? The gears have been double checked are setup in spec from revolution.

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[46flattie]

Driveshaft certainly could be the cause. Maybe check them over to see if there is any balancing weights are knocked off or other damage. Possibly if the shop did not mark and reinstall the driveshaft in the same orientation to the pinion flanges, I suppose this could cause it too. I try to do so when I remove driveshafts on the newer jeeps, not sure if it really matters though. Good luck.

 

[gearhead22]

Driveshaft certainly could be the cause. Maybe check them over to see if there is any balancing weights are knocked off or other damage. Possibly if the shop did not mark and reinstall the driveshaft in the same orientation to the axle flanges, I suppose this could cause it too. I try to do so when I remove driveshafts on the newer jeeps, not sure if it really matters though. Good luck.

I can’t guarantee but I would imagine the shop just disconnected it from the pinion side and let it hang, could be wrong though. I will check for spots indicating missing weights and also any marks potentially indicating they lined up the flanges. I doubt it was marked as that’s typically not a concern with most vehicles. I do have a carrier bearing drop that I installed a while back as well.

 

[Vtur]

Out of balance tires.

 

[UTDieselRubi]

I have been chasing a similar vibration. Its through the floor, makes my bed rack wobble like crazy. Same on all my tires sets so I dont think its tires. But I also got new gears around the time it started, and this thread just made me think of that. I dont imagine its the gears, but maybe the driveshaft got messed up on install. If I can solve mine, Ill let you know.

 

[gearhead22]

Out of balance tires.

This is a driveline vibration not a shake. It’s definitely not out typical out of balance tire feel.

 

[gearhead22]

I have been chasing a similar vibration. Its through the floor, makes my bed rack wobble like crazy. Same on all my tires sets so I dont think its tires. But I also got new gears around the time it started, and this thread just made me think of that. I dont imagine its the gears, but maybe the driveshaft got messed up on install. If I can solve mine, Ill let you know.

I will keep you updated as well! Mine doesn’t sound as aggressive as yours but certainly noticeable.

 

[JeepinPete]

A high frequency buzz is going to be the driveshaft related. Maybe it isn't fully seated on the pinion flange?

The driveshaft is turning more than a bit faster now. Assuming you were coming from 4:10's, your driveshaft is spinning 25% faster. Ever take it up to 90mph before the gear swap? That is about the equivalent driveshaft speed now.

 

[gearhead22]

A high frequency buzz is going to be the driveshaft related. Maybe it isn't fully seated on the pinion flange?

The driveshaft is turning more than a bit faster now. Assuming you were coming from 4:10's, your driveshaft is spinning 25% faster. Ever take it up to 90mph before the gear swap? That is about the equivalent driveshaft speed now.

Can’t say I had it to 90 before lol. Interesting that it’s that much faster now

 

[tysongladiator]

Not saying this is the issue, but maybe it's your pinion bearing.

 

[46flattie]

You might try removing each driveshaft one at a time and see if the vibration goes away. If so, you maybe able to get it down to which driveshaft is causing the vibration or eliminate the driveshafts altogether. Disclaimer - not sure if there is something that would prevent you from driving in 4wd with rear shaft removed....but I've done this on old school Jeeps

 

[gearhead22]

Not saying this is the issue, but maybe it's your pinion bearing.

Can’t watch it all right now but with the new gears the pinion bearing is new. Not saying it couldn’t be bad but it is new

 

[Sbro2021]

4.10 to 5.13= shaft spinning 1.25X faster than stock assuming no other changes (tires) Since most jeeps don't have AWD which yields a double ended CV shaft, I would surmise the vibration is the axle side shaft joint up front. If it isn't square to itself, at some speed it will vibrate. Mine does it when in 4wd at about 65 with 4.5" of lift up front on the stocker. 2wd I don't have vibes at any speed up to the 94mph my jeep junk is governed to. ( yeah I know I shouldn't drive that fast in 4wd..) Ain't nobody got time for that slow driving on the snow! My experience has always been when I've had speed sensitive vibrations, it's shaft alignment issues because of lift and the inability to correct the pinion angle out front because of the solid axle and all of that being set for stock height. Hope you find it!

 

[tysongladiator]

Can’t watch it all right now but with the new gears the pinion bearing is new. Not saying it couldn’t be bad but it is new

My pinion bearings weren't that old either. It wasn't because of the age of the bearings, it's the design that was the issue. But yea.... when you get a chance, just check it out.

 

[gearhead22]

4.10 to 5.13= shaft spinning 1.25X faster than stock assuming no other changes (tires) Since most jeeps don't have AWD which yields a double ended CV shaft, I would surmise the vibration is the axle side shaft joint up front. If it isn't square to itself, at some speed it will vibrate. Mine does it when in 4wd at about 65 with 4.5" of lift up front on the stocker. 2wd I don't have vibes at any speed up to the 94mph my jeep junk is governed to. ( yeah I know I shouldn't drive that fast in 4wd..) Ain't nobody got time for that slow driving on the snow! My experience has always been when I've had speed sensitive vibrations, it's shaft alignment issues because of lift and the inability to correct the pinion angle out front because of the solid axle and all of that being set for stock height. Hope you find it!

With the FAD my front driveshaft doesn’t spin in 2wd so that’s not the cause here. But I agree it could be if it wasn’t for that

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