I know it's a different body style, but my 46 had 4 holes for the back cab mounts, but only 2 were used. I'm not sure why this is, but 4 is not necessary. I'm thinking your 48 should be the same.


1946 GMC Pickup - S-10 Frame, 455 Buick, TH400, original patina.

My 46 GMC on Photobucket