^^^ completely agree with this post. Id also resist the urge to go 140 weight, unless jeep spec’d it. I believe they did in some of the GCs at some point, but it was a problem-fixer (axle tube alignment if i recall), not something which should have been required. Thinner oils carry heat from the gears to the carrier more effectively, from what ive read.
ill also throw in a vote for the amsoil diff fluids. And valvoline. Ive used M1 several times but it always drained startlingly thin, making me wonder if it was a bit sheer prone.