Nissan RN4F31A 4 Spd & RS5F31A/RS5F31G 5 Spd FWD Transmission Rebuild Kit Part# BK174AWS This transmission uses a two piece aluminum case and (2) differential bearings (Part# 32010) they measure 49.8mm inside diameter. The rear pinion bearing is 19.4mm wide. This transmission is a standard differential (non-posi). This transmission is found in the following Nissan applications: 5 Speed 200SX RS5F31G 4 Cylinder 1.6L 1995-98 5 Speed NX RS5F31G 4 Cylinder 1.6L 1991-93 5 Speed Sentra RS5F31A 4 Cylinder 1.6L 1990-99 4 Speed Sentra RN4F31A 4 Cylinder 1.6L 1991-93 This kit comes with the main bearings, input pocket bearing, bushing, seals, and synchros