Differential fluid counterweight??

I have a Ford Ranger 99 with 108000 miles on the differential, I be going to change out the fluid with Royal Purple Max Gear 85W140. Is that to sweet? The weather in my reagion is very hot surrounded by the summer over 100 and the winters rearly get below 40. Will this hurt the gas mileage on the vehicle or will it be ok. Just wondering if I need to thieve it back and pick up the 75W90. I do tow on occations but it is rare. Thanks

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I use an 80w on my 85 silverado.

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Answers:    85W140 will do a short time ago fine... but ideally, I would recommend either a 80W90 or as you stated... 75W90
I use an 80w on my 85 silverado.

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