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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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02-21-2015, 03:50 PM | #1 |
Zilvia FREAK!
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S13 Rear End Mystery Noise
So long story short my car started making some weird noises from the rear end about a month ago. I've replaced both axles (one had a torn boot, the other was just 25 years old) and swapped out diffs (the welded that was in it had broken welds). Now there's a fresh diff and 2 new axles in the car and I'm still getting the same noise. If it helps narrow it down any the car makes the most noise when I'm turning. Any ideas? I've given the subframe a once over and I didn't see any cracks but I'm not positive...
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02-22-2015, 01:15 AM | #6 |
Zilvia FREAK!
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The wheel bearings don't have any play in them and its a clunking noise not a constant whine. I've had wheel bearings go bad before and this is a completely different noise. It sounds like the rear end *thunks* every time the wheel makes a rotation.
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02-22-2015, 01:12 PM | #9 | |
Zilvia FREAK!
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As far as the jackstands thing goes, I think that's what I'm gonna end up having to do. I'm just not too fond of laying underneath a running car lol.
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03-04-2015, 09:04 AM | #11 |
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brakes look clean/clear and good?
egg-shaped tire? (or flatspotted them/one doing a long handbrake into a drift?) all nuts and bolts back there tight and torqued? Do any maintenance back there recently? Loose coilover nut? |
03-05-2015, 03:25 PM | #12 |
Zilvia FREAK!
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I went and worked on the car last weekend and couldn't find anything. Everything on the driveshaft was fine, every suspension arm was tight, brakes are good and the axles are still new. The tires are complete shit but I know the noise isn't coming from that. I got ANOTHER diff to throw at the car because at this point its the only thing I could think to be broken still. We'll see.
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03-05-2015, 05:24 PM | #15 | |
Zilvia FREAK!
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Spent close to two hours last weekend checking every single nut and bolt remotely related to the subframe and everything is tight. At this point I'm pretty sure I just happened to replace a broken diff with another broken diff, but I've been pretty sure the other 3 times I replaced stuff back there so I guess we'll find out.
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03-05-2015, 09:30 PM | #18 |
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Does it make any difference which direction you're turning? It could still be a wheel bearing, if the race or one of the balls has a flat spot. The ONLY way to COMPLETELY rule out the wheel bearings is to remove the axles and brakes and turn them by hand with nothing connected to them. With all the weight/drag connected to them you'll never be able to feel any roughness while turning them. Also, have you drained your gear oil from the diff to check it for metal debris. It could have a broken tooth on the ring/pinion or one of the side/spider gears.
EDIT: I see you replaced the diff. It is nearly impossible that you replaced the diff with another one that has the EXACT same problem. |
03-05-2015, 09:36 PM | #19 | |
Zilvia FREAK!
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As far as the diff goes, that's what I was thinking but I've literally exhausted every other possibility so I don't know. I picked up another welded for $40 so it seems like the cheapest part to troubleshoot right now and if it doesn't work I can sell the one that's in the car now.
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03-05-2015, 09:47 PM | #20 | |
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03-05-2015, 11:34 PM | #21 | |
Zilvia FREAK!
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Thanks for everyone's insight btw! Crazy how if you post a question legitimately hasn't been asked/answered on zilvia you get knowledge instead of trolls lol.
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03-06-2015, 10:14 PM | #22 | |
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03-10-2015, 08:30 AM | #23 | |
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Have you ran anything over recently? Might be a little far fetched but you could have broken loose one of your subframe studs.
I did that in an old hatch and took me a year to find the rear end noise.
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03-12-2015, 12:10 AM | #24 | |
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I currently have a whole mess of suspension parts ready to put on this thing (not all related to solving the noise), just waiting for a day where I have the free time to waste 5-6 hours working on it.
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03-17-2015, 10:50 AM | #25 |
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Went and worked on the car yesterday, meant to both throw on the new FLCA and swap out the diff but I ran out of time. I'll swap diffs sometime this weekend and let you guys know how it goes.
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03-23-2015, 11:51 AM | #26 |
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Another update for you guys. I threw another diff in the car but I haven't been able to drive it yet. Reason being I put extended FLCAs on the car and my fronts rub the fenders now. While I was attempting to pull the bolt on spacers off I rounded 3 of the stupid little nuts that hold the spacers on and now they're hoplessly stuck to the hubs. I've tried drilling them off, hammering etc and nothing works.
Does anyone have ideas for how to get these stupid things off? I'm about to just buy a pair of new front hubs and brake discs to throw on the car...
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03-23-2015, 10:40 PM | #27 | |
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03-24-2015, 08:53 AM | #28 |
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Try heating up just the nut and use locking pliers. See how that goes..
Is the car super low? maybe its the angle of the axles causing some binding.
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03-24-2015, 11:18 AM | #29 |
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I'd drop the subframe and look at your subframe bushings, sounds very similar to a bad subframe bushing that I had, that wasn't apparent until I dropped the subframe. I mean it is more than 20ish year old rubber. My clunking wasn't apparent until I dropped the subframe and saw it was a bad bushing. If you have checked everything else, but haven't seen both sides of those subframe bushings, that'd be my guess.
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