ae82gunner

Hi guys, I need to buy a gearbox for my nissan bluebird SSS as my one has shit itself. My engine is the 2.4Litre one. So i think that means it's the australian model. Can anyone tell me where the best place (in sydney south preferably) is to get a gearbox either second hand or from a wrecker ? Alternatively, where would be the best place to get this one rebuilt ? Thanks in advance for any input you guys may have !