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Truck started "clunking" on the left side front when I engaged the 4x4.
Tried with hubs out, transfer in, no clunking.
Tried with hubs in, transfer out, no clunking.
Tried with transfer in and right side hub engaged, no clunking.
Tried with transfer in, left side hub engaged, no clunking. Hubs in transfer in, loud clunking on left side that gets worse with speed.
Think that could be a U Joint? Everything else on the front end looks good so I'm assuming that's all it could be.
Would seem like a bad universal joint. easy to check. With hubs unlocked pry on the joint with a screwdriver, you will soon see if there is play in it.