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needs a pinion seal...
 

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Looks like a pinion seal leak. It could lead to bearing failure when the fluid level gets too low in your axle.
 

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Mine leaked with about 50k miles on it. Took it in and had it fixed under my extended warranty
 

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Discussion Starter #7
Reading a little more on this it seems to be a fairly straight forward repair. Any suggestions or things to look out for?


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check your vent tube also , if it's blocked pressure builds and will force oil past a seal.

that nut has a preload if your just pulling the nut to do the seal mark the nut on the pinion,and count the threads so you put it back exactly where it was
 

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I done this repair to my truck last year just be sure you mark your driveshaft flange and count threads on the pinion nut. Not to bad of a job seemed to work for me no problems as of yet.
 

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Discussion Starter #10
Is this something that can be done on jack stands or do I need a lift?


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Discussion Starter #12
I was under the impression I needed to take the wheels and drums off.


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There also a chance your pinion bearings are going bad that why the seal is leaking.


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u pull the drive shaft (on mine I can just wire it up to the cross member to keep it out of the way ,, mind the u-joint doesn't fall out) at the axle remove the pinion nut and u joint yoke then
R&R the seal

at least at my best recollection lol but you don't need to remove tires
you just need to get to the pinion nut and then to the seal .

risco is correct it is possible but not common

Edit this truck is easier than my procedure above since the ujoint and yoke don't need to be separated they are bolted on with 4 bolts just make sure to set your brake and chock the wheels
 

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I done mine with the truck on the ground and with the wheels still on. This would also be a good time to change your gear oil. I pulled the rear cover cleaned everthing and refilled with Amsoil Severe Gear diff. fluid.
 

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To the op is your carrier bearing bad?
 

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Discussion Starter #18
The bearings were good. It was a little low on fluid though. It took about two hours to complete it.


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