Humming noise coming from the rear.

[Shagnaz]

Just in the few days, there has been a humming noise coming for the rear end or drive shaft. I just recently got a set of gears installed along with my detroit locker too. I have right at 500 miles now.
Tonight, I jack the rear of the blazer up and set the cruise control. With the cruise searching (speeding up without a load) the pinion was moving in and out alittle.
AAAAA! There is my humming noise (only under load).

What hold the pinion in place so that is doesn't move in and out of its carrier.
I am going to be bring it back to the guy tommorrow, but would like to know some info before I go.

Thanks,
Mike B
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[90K5]

sounds like your rear end is bad, you get a warranty?

 

[MudbogAD]

Maybe the guy who installed it didn't crush the crushsleeve on your pinion.

 

[Shagnaz]

So, the crush sleeve is what holds the pinion from moving in and out?
Thanks
Mike B

 

[Shaggy]

<font color="green"> Yes, if the crushsleeve was not fully crushed the bearings will not seat, and will allow the pinion to move in and out. </font color>

 

[Shagnaz]

Thanks, how do you crush the crush sleeve?

 

[Shagnaz]

Humming it gone...it was the pinion nut. It worked itself loose, so the guy retorqued it. Weird?

Thanks for y'all's help!

Mike Babich

 

[Muley]

Did he reuse the old pinion nut? They should not work them selves loose. Pinion nuts are throw away nuts. Everytime you take them off you throw them away and replace it with a new one. I would check on this. Otherwise it will be back. You might have other problems as well cause you should replace the crush sleeve each time you remove the nut.

If the guy just torqued it down some more to make the noise go away then that could be a serious problem. To much torque on the pinion nut does not let the pinion turn freely like it should. Could cause the pinion to sheer. If nothing else it will roast the pinion bearings.

So I say take it back and have him put in a new crush sleve and use a new pinion nut. Make sure he uses some lock-tite also.

just my .02