Well, to complicate matters further(i always do this
,
EDIT comments withdrawn----the matter is too complicated for me.
b) Additionally, apparently std ratio varied from yr to yr. For instance my 83 1/2 ton is 2.56 as std ratio(which i thought applied across the board from 81-87 in all weight ratings but apparently not so)
c) i now think, due to more info/intervention by D13+more research(brouchures) you got a 3.08 because of the diesel engine, but i think it's best at this point i withdraw from the thread due to the increasing complexity of the situation and merely observe and learn.