According to the LMC Truck Catalog: 10 = 1/2 ton; 1= 116" wheelbase; 22= 228 in-line 6; P= Pontiac Mich. Assembly Plant. Note: their chart states that "1951 models did not use Assembly Plant codes", so you may not have a 1951? Hope this helps!


Charlie

'51 3100 5-Window (Restomod in progress)