Loud front end when hubs are locked in (1 Viewer)

Joined
May 28, 2020
Messages
103
Location
Pennsylvania
When my hubs are locked in you can hear and feel the difference noticeably . Fluid levels are fine. I do see the knuckles need attention as they are a little leaky but I'm saving that project until next winter. It has the stock everything. Are the hubs ever an issue for such a thing or the wheel bearings. ?
 
Joined
Jan 17, 2005
Messages
5,629
Location
Southern Colorado
The mechanical locking hubs have nothing to do with your noise/vibration (or shouldn't).

When you lock the hubs, you are now spinning everything (axles, ring/pinion/driveshaft) back to the front of the transfer case. Could be your driveshaft u-joints, could be a lot of things. If you totally repack the front end (and adjust the wheel bearings) and the problem is still there, then it's likely the driveshaft. I would not wait until next winter to address all of this!

On a properly maintained FJ40/60 - when the hubs are locked and you drive 60-65, you might feel a faint vibration that wasn't there, and possibly a very faint noise. Sometimes I cannot tell that I forgot and left the hubs locked.

Start by lubing the front driveshaft u-joints and splines (thoroughly) and see if that helps.
 

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