During some recent maintence on my truck(2003 f-150 4wd),I got the recommended fluids from the owners manual, for transmission (Motorcraft Mercon v), transfer case (Valvoline Dexron/Mercon),front differential (Supertech 75/90),rear differential (Valvoline 75/140).All of these were the factory fill with 285,000 miles on them and surprisingly the old oils looked good.While changing the rear diff. on reassembly I found a tag that states 75/90 fluid only! .I refilled with the 75/140 without concern but I do think it is odd that the manual states a different viscosity than the tag on the rearend. Any others seen this before?