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What Gear Lube do I use in this situation

Bought a 1993 FLD with a super 10 and it has 4.10 Rockwell rears, it’s about ready for the road and was gonna change the rears and Tranny Lube, I know somebody that runs 80/90 in all 3 in a 94 Pete for years never had an issue, I called where I bought it they said they ran 85/140 in the rears and 80/90 in the tranny, so the question I have is do I keep running the same? Do I flush it out and run something else or just run 80/90 in all 3 ?

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75/90 gear lube in rears and 50 tran oil in transmission is what I have always used both of these are synyhetic oil

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If I were to change grade don’t the tranny need to be flushed out ? I don’t know about putting synthetic in an old truck like that now, it already has over a million and half miles on it

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No. Besides if the oil is good and hot it when you drain it will drain very well

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50 wt in the tranny.

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