Message: Ok folks I am upgrading to 4.56 gears and a posi lock in my 3.9l 98 slt to allow for my lift and bigger tires 32". My question is what grade of oil should I put in, the oe book says 75-90 I think. I was wondering if it would be ok to put something like 80-140 I thought it might be better, but I dont know. Any info would be great!
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Subject: Rear Gear Oil