Hunting from the outside, the only real differences I could see was the 4afe block had no mounts for that driveshaft brackets. Internally, 4AFE had no oil squirters. Both are 7 ribs too. We intended a backing plate that perfectly mounts up into the Silvertop and Blacktop 4AG and makes https://brianm383wnc7.muzwiki.com/user