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Changed Rear Differential Fluid @ 92K on 2008 Truck


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First time and it definitely needed it; Lube was black and there was about 1/8" coating of  ground up sludge on the magnetic fill plug. Gears etc were not gunked up though.

 

The old fill plug was seized in the cover so a replacement cover was in order. The GM cover kit includes a cover (unpainted!), redesigned fill plug, a nice thick gasket, all the bolts and a  new bracket for the brake line junction block support. The whole thing was only about $60 so it's not worth the effort to restore the old parts.

 

 Panhard brace was in the way and the sway bar link in the way of that. Twelve years of winter snow melting chemical corrosion made the job more than routine.

 

The new fill plug is very nice because rather than a pipe thread seal that allows weather corrosion into the threads the new plug as a large head that overlaps the edges of the hole in the cover and has a sealing washer between the head and the cover that seems like it will prevent exposure of the threads to external elements. The threads may be exposed to lubricant that will prevent bonding of the plug to the cover (fingers crossed).

 

Replaced the panhard brace too that looked like it came from the bottom of the ocean. Again, it was too cheap to bother with restoring the original.

 

Thank you Rock Auto on two counts for genuine GM parts. I was surprised at the Microsoft-like holographic labeling.

 

Based on the color of the lube removed, there should be a lube changing schedule in the maintenance schedule.

 

Edited by Beamie
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