[quote author=76Broncofromhell link=board=5;threadid=12631;start=0#94434 date=1040951139]<br>I use 80W-90 in both, but I was thinking of switching to 75W-140 in the transmission to have a little bit better shifting.<br>[/quote]<br><br>Bingo,<br>The author here says it right. 80-90 in the diffs. and if you have trouble shifting in colder climates, that 75 weight works very well. If you wanted to pay the extra dough for synthetics, I've heard that it makes the gears run cooler.<br><br>BH