Well... I went out to the shed (-2F) and looked at the sticker again. The front axle is 4060 and the rear is 6084. This does seem strange to me as the Original tires seem to be load range D but the total is for 2 load range E 235X85X16 tires now days.
My rear is a 3.55 as I have the 5 speed with a overdrive. Could be with the auto and 3.07 they aren't rated as high ?
Added later:
I looked at Dodgeram.org and didn't find much on these old trucks there. But did find out on other sites that 3 different tires were offered including the 235X85X16 E so thats where mine gets the rear axle rating of 6084 and the GVW of 8510
What yours came with is anybody's guess ???