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Re: Question about Transmisson and Rear End in 75 GMC Camper
Good Morning, With the amount of miles if they are correct I would recommend not doing a complete flush. Just drop the pan and change the filter, discard the fluid out of the pan only then ad the proper amount of new fluid back in. If it's really brown and smells bad you're likely going to need a rebuild. Let others weigh in on this before doing anything.
As for the differential is it limited slip? If it is... make sure you use the additive for limited slip differentials, 90 weight gear I believe is the normal lube to use with or without posi.
God Bless, Terry
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