Wanting from the exterior, the one variations I could see was the 4afe block experienced no mounts for the driveshaft brackets. Internally, 4AFE had no oil squirters. Both of those are 7 ribs far too. We built a backing plate that perfectly mounts up for the Silvertop and Blacktop 4AG https://chiefk405fvm1.wikiexpression.com/user