Acura Integra A1 S1 5 Speed Transmission Rebuild Kit This is a front wheel drive transmission that uses ball differential bearings and a ball rear input bearing with a 70mm outside diameter. This transmission was used for the 1990 S1 and 1991 A1 Acura Integra that used the 1.8L engine only. BK350WS This kit includes the main bearings seals, and synchro rings. This is an actual picture of the item for sale.