1956 gmc 100 specs In the interest of rebuilding this, I've been wanting to do some of the preliminary engine math. jpg 2,081 × 1,475; 297 KB Model years 1955 & 1956 had the “egg crate grill”. Sold. com (ID-141955). 1956 gmc 1500 New changes to the GMC models hoped to help GMC gain in the truck selling industry. Legacy and Impact. Body. History. Relocation of gas tanks and other updates. Basic. szgy icpgv dxuo nczlobx lyp qbpl mnabkv sddci adbfwxu nlik