I downloaded the CD service manual and it seemed to specify (using temperature charts) different weight oils for the front and rear differentials (based on our temp range in the NE).
I decided to go with Royal Purple synthetics and put MAX GEAR - 75W90 in the front and MAX GEAR - 85W140 in the back. I ordered them here:
http://www.store.yahoo.com/racingsup...yalpurple.html
Some folks say use the same weight, I'm not sure which is better or why. Maybe the manual assumes you are most likely to kick in the front axle in very cold weather without time to get the gear oil good and warmed up.
Dextron III is correct for the transfer case and transmission.
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