I'm trying to identify the rear axle on my 1950 4100. It's possilbe that it is not original to the truck. The only ID numbe I could see was on the differential case itslef, not the axle tube, front side; the first character was pretty well obscured could have been a Q or O but it probably was a zero; I read it as 034835. Does anyone have a good link to an axle ID decoder (the links I found did not have this style ID); or can anyone identify the axle based on that number?