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....ehhh
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931 Posts
Discussion Starter #1
1991 F-150 4x4 duh.

manual T-case
manual locking hubs.

Starts to squeal after about 5 min. in 4x4.

Still has noise when hubs locked, but 4x4 not engaged.

Nothing when hubs are unlocked even if 4x4 is engaged.

I suspect the locking hubs myself. Could it be a carrier bearing etc?

The squealing has to be between the hub to carier right?


Thanks

Joe
 

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o[|||]o
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11,147 Posts
Sounds like something in the hubs to me. If it were in the carrier, you'd probably hear it with 4x4 on and hubs unlocked (unless it needs to load of the tires to be audible). Get someone to listen for you, or to drive slow and you listen. Shouldn't be too hard to track.
 

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It's definitely NOT in the hub locks. There's nothing moving in there when they're LOCKED. It's when you UNlock them that stuff starts spinning.

I'd guess the inner spindle seals & bearings are going out. When you unlock the hubs, but leave it in 4, the bad one binds up & stops that axle stub from spinning, so all the torque from the t-case goes to the good one, that's not squealing. But it might also be a diff seal.

But when the bad one is locked, it has to turn, whether the t-case is in 4 or not.

Try locking only 1 hub at a time (in 2H on-road, anytime) to see if you can isolate the noise.
 
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