3432487 is a 8 3/4 29 spline yoke 7290. brads nos shows online that they have one. mopar still sells them but you won`t like the price. make sure that is what you need before you order. some b bodies with 8 3/4 came with the small joint also but a 400 4bl should be a large joint. http://www.bradsnosparts.com/inventory/searchResults.asp