40/41 Truck cab measurements.

[GB SISSON]

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I forgot how many of these I had around the place... I measured 5 of them. The sixth is the foyota's factory cowl. Which was slightly modified in that area. To measure the width I cut a stick at 40 1/2". This cut was plumb on the rear face. Looking at the stick in plan view(from above) it has a 5 degree back cut.
On my avatar tonner the stick presses in at the center of the hinge vertically(middle screw) and stays. In the woodie it works out to 40 5/8" as stick has 1/8" end gap. In Oscar(a parts truck) It is snug at same point and on both cab in the woods the stick becomes tigh at abour center of top screw in the hinge. So I will say they vary from 40 7/16" yp 40 5/8". If I were installing a floor I would pick 40 1/2" between piller at rear center of hinge.