Rear Differential Pinion Seal Replacement

This is a video I made while replacing the rear differential pinion seal on a GMC truck. I did this one without removing the rear diff cover, but you can do it either way.

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Autos & Vehicles

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[boomstickkid]

could i use these same instructions to change the yoke itself?

[roadragecustoms]

@boomstickkid Yes, you can.

[richu27]

Is the shock absorber bad too in because the up and down movement of the vehicle is not stopping.

[roadragecustoms]

@richu27 The whole vehicle was rocking. The legs of the lift flex a little bit.

[Diezeltube]

I feel dumb for asking but when would you determine that you need to replace the seal? Leaks 

[roadragecustoms]

@Diezeltube Yes, this one was definitely leaking. The outside of the diff was wet, especially on the front around the seal.

[grayjiang]

A couple of things I've never seen done should be pointed out to anyone who hasn't done this before; never use RTV sealant anywhere for this repair; not that it will hurt anything, but it will make a mess when the next guy has to remove the pinion seal again. I would not recommend anyone use an impact wrench for putting the pinion nut back on, a new nut should be used also. A beam type torque wrench should be used before and after to check preload on the pinion bearing however it's OK this way.

[mrjost55]

you have a weird intro, but the videos are good.

[Lagzal0t]

@grayjiang but its ok to use rtv seal on the differential plate when completely emptying out old fluid for new fluid in order to maintain a proper seal..i doubt the rubber seal alone is sufficient..correct me if im wrong.

[9Tracer9T]

Ya I wondered bout the RTV and the Impact

[btarrh]

Sometimes it's worth while to replace the bearing and crush sleeve and reset the preload on the pinion just to be sure.

[mflorido]

Thank you for this vid. It's no BS. All detailed and explained well enough without any non-sense. Straight and to the point. Excellent!

[Despized]

Thanks a bunch for this. Helps out a ton.

[onlyridechevys]

Thank you for this video .

[badawg1962]

wow 6 and a half minutes ... i was thinking it was gonna take most of my morning :O)

[mattspew123]

Great video!!! Inspired me to replace the seal on my Paj myself.. It really was a simple job. The only extra thing I did was clean the diff breather. A week later and no more leak!!