Q: How to remove and install the manual transmission assembly on the 1992 Nissan 240sx?
A: To remove and install the transmission on 200SX and 240SX models, begin by safely raising and supporting the vehicle, then disconnect the negative battery cable. Disconnect the back-up light switch and neutral switch if applicable, followed by the accelerator linkage. Match mark and unbolt the driveshaft at the rear, removing it, and if there is a center bearing, unbolt it from the crossmember while plugging the end of the transmission extension to prevent leakage. Disconnect the speedometer drive cable from the transmission, place the shift lever in the N position, remove the E-ring, and pull the shifter lever out. Remove the clutch operating cylinder from the clutch housing, support the engine with a large wood block and jack under the oil pan (avoiding the drain plug), unbolt the transmission from the crossmember, and support it with a jack before removing the crossmember. Lower the rear of the engine for clearance, remove the starter assembly, and unbolt the transmission assembly from the engine, lowering and moving it to the rear while tagging the transmission-to-engine bolts for proper tightening during installation. For installation, clean the mating surfaces, lightly lubricate the clutch disc and main drive gear splines, and lubricate the rear extension oil seal lip and bushing with clean transmission fluid. Properly support the transmission and raise it onto the engine, then use specified torque settings to bolt the transmission to the engine based on the model and engine type. After securing the starter assembly, raise the engine back to its original position, bolt the crossmember in place, and remove the jack. Bolt the clutch operating cylinder to the clutch housing, install the shift lever and secure it, connect the speedometer cable, and install the driveshaft ensuring proper alignment of flange marks. Reconnect the accelerator linkage, neutral safety, and back-up light switches if equipped, then reconnect the negative battery cable, lower the vehicle, check the fluid level, and conduct a road test for proper operation.