open diff question. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kazuma · 07-13-2005, 12:50 PM

okay here is a question i got for you tech guys . i have a 90 240 and have had a problem ever since ive had it. when i am accelerating in either first or second gear i hear this very loud grinding noise coming from underneath the car(driver and back cant really make it out). now i had it checked out and what they did is they put the car on a hoist and drove the car(rear wheels were free to spin basically no load on them) and this sound wasnt present any more so the guy that looked at it for me told me its my diff and that it either needs to be rebuild or replaced. now yesterday me and my buddy were just testing something out when we noticed something. when the car is in gear(either first or second) the grinding noise is there but as soon as i put it in neutral the sound goes away.

anyways to my question. when the car is in neutral is the driveshaft spinning the diff or is the driveshaft not moving or moving at a very low rate of speed? reason i ask this is because we thought maybe my transmission was fucked but if the transmission was fucked wouldnt it still have the same noise when it was on the hoist with the rear wheels spinning freely?

thanks in advance.

07-13-2005, 12:50 PM	#1
kazuma Zilvia Member Join Date: Jul 2004 Location: winnipeg, manitoba Posts: 150 Trader Rating: (2) Feedback Score: 2 reviews	open diff question. okay here is a question i got for you tech guys . i have a 90 240 and have had a problem ever since ive had it. when i am accelerating in either first or second gear i hear this very loud grinding noise coming from underneath the car(driver and back cant really make it out). now i had it checked out and what they did is they put the car on a hoist and drove the car(rear wheels were free to spin basically no load on them) and this sound wasnt present any more so the guy that looked at it for me told me its my diff and that it either needs to be rebuild or replaced. now yesterday me and my buddy were just testing something out when we noticed something. when the car is in gear(either first or second) the grinding noise is there but as soon as i put it in neutral the sound goes away. anyways to my question. when the car is in neutral is the driveshaft spinning the diff or is the driveshaft not moving or moving at a very low rate of speed? reason i ask this is because we thought maybe my transmission was fucked but if the transmission was fucked wouldnt it still have the same noise when it was on the hoist with the rear wheels spinning freely? thanks in advance.