This is a transmission rebuild kit for the 1991 Acura Integra 5 Speed A1 transmission. 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 in 1991 in the Acura Integra that used the 1.8L engine only. BK350AWS This kit includes the main bearings, seals and high quality synchro rings.