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Changed the rear differential fluid; something I'd not yet done before on this. Cleaned all inside with carb cleaner. Painted the outside portion of the diff cover silver. And found a drill attachment wire wheel worked well for cleaning all mating surfaces. I used a GM OEM rubber gasket to put back together (part #26063649 below for reference but note this for a 14-bolt rear end). Man those flexible Valvoline gear oil pouches are amazing for refill!
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Would you please use longer bolts next time so that you can add more farkin' worshers and nuts? Thanks