Interesting problem here. I went and got out the 47 retro pac that GM sent me. This is what the sheets say.......The rims on this truck belong to a 3800 series, using a 7.00x18 tire. If it were a 4100 or bigger truck, it would have a rim with only 5 cut out holes instead of the 8 in the picture. It would also have a tire size of at least 6.50x20. According to these papers, there are no dual wheeled 3800's offered in 1947. You would have had to gotton a 4100 or bigger for that option. Possibly this truck has had it tires & rims changed, may not really be a 47, or the build sheets are wrong. The 4100 series is listed only as a 1 1/2 ton truck. Another way to tell, would be the emblam on the hood. If it says Thriftmaster on it, it a 3800, if it says Loadmaster its a 1 1/2 ton or bigger. Going back to the rim...its an 8 bolt one, the 5000 and 6000 series trucks used a 10 bolt one.
