Another indication is the rear drive shaft. On 134"WB vehicles it runs straight from output flange on the transfer case to the flange on the rear diff. On 158"WB vehicles it runs horizontally from the transfer case to a frame mounted bearing then angles down to the rear diff. It's not necessary to see more than a portion of the driveshaft to see where it's pointing to: either to a point near the rear of the cab, or to a point halfway along the chassis. This, of course won't help in trying to separate the 30cwt from a 60S.
BTW, David, it's the book filled with CMP pictures we would actually like to see first!
