Just my new 240... has weird noise... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Sleeping240 · 02-21-2004, 10:34 PM

i know its comming from the rear end.... the guy said he changed the stock rear end with teh j30...... every time i downshift to slow down i hear a clunk... at first i thought it was my spare tire..... but it wasnt....

need help.

twitchy · 02-22-2004, 02:48 AM

suspension or subframe maybe?? is it definitely the diff?

adey · 02-22-2004, 03:14 AM

Can you give us a little bit more info. on what the sound sounds like and when it happens?

Do you hear it ONLY when you downshift (do you revmatch or double clutch?), or do you also hear it upon deceleration (i.e. off-throttle)? Is it a loud metallic clunk, or more of a plastic/other sound? ... does it seem to come from the interior or does it "resonate" from the frame/chassis?

My first thoughts would be either a lousy J30 VLSD install since he mentioned it... although it could be any number of things from worn subframe bushings to a loose exhaust to dying suspension pieces.

thx247 · 02-22-2004, 09:51 AM

the diff is probably loose in the back. Make sure that there is ZERO freeplay in the mounting of the J30 diff. The J30 comes with metal bushings supported by some weak rubber. It doesn't take more than a few miles to tear that rubber off of the diff and now the diff bounces up and down on the bolts holding it in. If you search for how to mount the J30 diff you will find more info on this problem.

You need to get some washers and large bolts to hold the diff in place properly.

nightwalker · 02-22-2004, 10:04 AM

it's squirrels. They're trying to open their nuts. hehe. Most diff-inately the diff.

cowbomb · 02-22-2004, 11:10 PM

could be a bad axles.... maybe , only when u downshift?

02-21-2004, 10:34 PM	#1
Sleeping240 Zilvia Member Join Date: Jan 2003 Location: Orange park, FL Posts: 190 Trader Rating: (0) Feedback Score: 0 reviews	Just my new 240... has weird noise... i know its comming from the rear end.... the guy said he changed the stock rear end with teh j30...... every time i downshift to slow down i hear a clunk... at first i thought it was my spare tire..... but it wasnt.... need help.

02-22-2004, 02:48 AM	#2
twitchy Zilvia FREAK! Join Date: Apr 2003 Location: Ontario Posts: 1,579 Trader Rating: (0) Feedback Score: 0 reviews	suspension or subframe maybe?? is it definitely the diff? __________________ Who the hell needs a sig anyhow

02-22-2004, 03:14 AM	#3
adey Post Whore! Join Date: Mar 2002 Location: Hong Kong Posts: 3,072 Trader Rating: (0) Feedback Score: 0 reviews	Can you give us a little bit more info. on what the sound sounds like and when it happens? Do you hear it ONLY when you downshift (do you revmatch or double clutch?), or do you also hear it upon deceleration (i.e. off-throttle)? Is it a loud metallic clunk, or more of a plastic/other sound? ... does it seem to come from the interior or does it "resonate" from the frame/chassis? My first thoughts would be either a lousy J30 VLSD install since he mentioned it... although it could be any number of things from worn subframe bushings to a loose exhaust to dying suspension pieces. __________________ Instagram: @SX180HKG

02-22-2004, 10:04 AM	#5
nightwalker Nissanaholic! Join Date: Mar 2003 Location: Bay area Age: 46 Posts: 2,146 Trader Rating: (0) Feedback Score: 0 reviews	it's squirrels. They're trying to open their nuts. hehe. Most diff-inately the diff. __________________ In life, we often cast the line of hope fishing for the best possible opportunity. Sometimes with enough effort, the things we catch are nothing short of amazing.

02-22-2004, 09:51 AM	#4
thx247 Zilvia FREAK! Join Date: Jan 2003 Location: bay area Posts: 1,455 Trader Rating: (0) Feedback Score: 0 reviews	the diff is probably loose in the back. Make sure that there is ZERO freeplay in the mounting of the J30 diff. The J30 comes with metal bushings supported by some weak rubber. It doesn't take more than a few miles to tear that rubber off of the diff and now the diff bounces up and down on the bolts holding it in. If you search for how to mount the J30 diff you will find more info on this problem. You need to get some washers and large bolts to hold the diff in place properly.

02-22-2004, 11:10 PM	#6
cowbomb Leaky Injector Join Date: Jun 2003 Location: Socal Age: 43 Posts: 95 Trader Rating: (0) Feedback Score: 0 reviews	could be a bad axles.... maybe , only when u downshift?