Nissan 31020-3TX0A Automatic Transmission Assembly

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The engine can stay in the car while removing the gearbox, or else both the engine and gearbox can be removed together and separated later on. It is recommended that when removing the transmission, replace the clutch slave cylinder so as to prevent leakage of fluid. The transmission model code number can be found on a label located on top of the transmission housing. Begin lifting up the front of the vehicle by applying handbrake and jacking up its front. Remove both frontal roadwheels and offside front wheel arch liner. Drain oil from gearbox into a suitable container then refit drain and filler/level plugs. Remove battery, battery tray, air cleaner assembly, starter motor, and exhaust front pipe. Let gearchange cables go slack and release front suspension subframe. Be careful to adequately hold up two foredriveshafts from gearbox. Disconnect earth lead, wiring connector from reversing light switch, and crankshaft position sensor. Disconnect slave cylinder connector pipe from hydraulic pipe and plug it at each end to stop leakage of fluid. Free harnessing loom from any retaining clips so that it is clear of transmission. See to it that breather hose on top of gearbox case is not secured to any other part(s). Get rid of rear engine mounting bracket/arm link connected to torque tube joint (aluminium). Use hoists or jacks to lift engine & box assembly into position. Take off lefmotor/gearbox mount plus mounting plate above box-top cover at any given time thereafter. Unscrew remaining nuts fixing gear box house to engine block; pay attention to their positions order during disassembly process. If necessary raise box slightly for lower bolts access. Ensure all necessary components are disconnected from gear box before moving it out with jack. Slide jack away towards left side so as to unhook it partly from locating dowels; then lower jack to remove gearbox from under the vehicle. Remove locating dowels if loose and keep them in safe place. To refit, follow the reverse of the removal procedure. After removal, replace concentric clutch slave cylinder, apply a small amount of high temperature grease to input shaft splines on gearbox, make sure locating dowels are properly positioned inside bell housing, install transmission-to-engine bolts into their original locations, and torque all nuts and bolts to specified values. Fit back driveshafts etc., front strut assembly and bleed hydraulic clutch system. Lastly, reinstall gearchange cables and test their operation; then refill transmission with prescribed oil grade.

It is advisable because internal transmission components can be difficult to obtain and expensive.

Yes, for improved access, you can jack up the front of the car and securely support it on axle stands. However, the car must be lowered to the ground and made level before refilling and checking the oil level.

Remove both driveshafts, disconnect wiring connectors from various components around the engine (labeling them if necessary), disconnect all vacuum hoses, remove the air cleaner assembly, disconnect fuel feed and return hoses, and disconnect relevant electrical connectors.