You should get a passenger or mount a gopro near the noise and take it for a spin, then share it on here.
Quick question...is the diff GL-5 compatible?
You should get a passenger or mount a gopro near the noise and take it for a spin, then share it on here.
Quick question...is the diff GL-5 compatible?
I don't have a GoPro =( BUT! I will jack it up and simulate the noise on video for you guys, and then another with my friend taking a video while I drive it. I'm gonna drain the oil today and see if I notice anything unusual in it like shavings.
Yes, the diff is supposed to be able to take GL-5, at least according to page 3 of the differential section of this link I'm gonna post here for future reference for anyone interested. https://docs.google.com/folderview?i...EdwS0xSNGVXMzA
kung fu jesus (07-29-2014)
Okay! Noise is still there. Videos will be up soon when I have time/get home. Shook the wheels, no abnormal slop or play in the hub, so I think the bearings are okay. R&Red the diff oil. No metal chunks or shavings in the oil; it was super clean. On the magnetic drain plug though, yes there was some, but I don't think it's an amount to worry about, but then again, I forgot to clean it before I installed it from the previous owner so it could have been years and years of accumulated debris. Cleaned it this time though! I think the prop shaft u-joints were in good condition when I installed it though, but next time I get a chance I will take it off and move it around. I sprayed white lithium grease on the joints though and... The noise was there.
Are your axles fully seated into the differential?
I believe they are. Holding it as level and straight as I could, I basically shoved it in, and tried to pull it out with some force to double check if it was successful. No oil leaking anywhere. Videos are being uploaded now and will post here when done.
uploadfromtaptalk1406756405483.jpg
here's the drain plug yesterday. Changed to Mobil 1 gear oil now.
Last edited by iKhanh; 07-30-2014 at 04:48 PM.
That's a lot of shavings for only 15 miles. They look a little big, too. Without hearing the video, I would lay odds on the bearings in the diff.
my friend was recording on my phone while i drove.
Miata driving noise: http://youtu.be/sZ5HiZjoiXY
several times in the video you can hear a noise like something is winding/whirring down in speed
Miata driveshaft noise: http://youtu.be/CRyTlDm80L0
in this video, my friend is rotating the wheels by hand while i'm under the car. you can clearly hear the noise that sounds just as if the pads were touching the rotor. i'm not sure if it's the driveshaft, but it just sounds more apparent in this general location underneath the car.
i'm about to go to my Miata and disconnect the driveshaft and mess with the u-joints, and also rotate the wheels and see if the noise is gone. if the noise is gone after the driveshaft has been removed, would it be safe to say that it's the u-joints? i've read that the MSM driveshaft is the only Miata driveshaft that has serviceable u-joints, but that some people have still had it fail after service, and that they recommend just getting an aftermarket one from like 949 Racing. don't really wanna spend $300 though..
as for the shavings, i don't think that's only my doing. i forgot to clean it prior to install so that might have just been from the previous owner, or the owner before that. i will change the oil again after i drive it some more and see what it looks like then.
Last edited by iKhanh; 07-30-2014 at 08:01 PM.
Videos are private, dude. You need to make them public.
***NVM, I see them now.***
Last edited by kung fu jesus; 07-30-2014 at 08:00 PM.
oh yeah, ha, sorry, fixed. =)
I think I can hear the friction noise you are referring to. I can see in the second video, someone modified the balancer rather poorly. You even remarked the input looks a little messed up.
Is the dragging sound coming from the transmission, driveshaft, or differential in the second video?
Yeah I always wondered about that balancer thing you mentioned, but i've read elsewhere that it actually doesn't pose a problem.
It seems a bit more noticeable when I was under the driveshaft. My transmission never made that noise before the swap. But once I disconnect the driveshaft, I can further deduce what may be the culprit. Will update soon.
Does what remains of that balancer spin independently? I have seen those come loose on the Torsens and make a similar sound.
I've been told that spec miatas replace the balancer as soon as possible because of its constant failure. Now, when i applied finger pressure to mine, I did see it move a bit. But looking at your drain plug, that's a lot of crud. Was it sparkly or gritty looking?
I thought i heard the whining noise in the video and was like that's the same sound.
Before I say its definitely your diff, make sure the heat shield to the gas tank is not interfering with the drive shaft or the balancer.
What's left of the rubber on the balancer is stuck on there; doesn't spin freely.Originally Posted by kung fu jesus
mini_fd: Ehh, it was mostly gritty after i soaked up the excess oil on it. But if I decide to drive it like this, I'll drain it once again after some miles. And nothing is touching the driveshaft or balancer.
Update: With the driveshaft out, spinning the wheels still makes the same noise. I will post another video that's more or less the same thing. So that leads me to believe that my driveshaft and transmission are okay, as well as my axles. I am guessing it would be a bearing inside that's not rolling as smooth anymore. Anyone know if the bearing(s) inside are lubed by the oil, or are they closed and have their own source of lubrication (greased bearing races perhaps)? And what are my options at this point if my diff is the source of this noise? When I took it apart the case last year the teeth looked good, but I'm no expert.
Miata diff: http://youtu.be/HvKEo5o5ZMc
Last edited by iKhanh; 07-30-2014 at 11:47 PM.
Yeah, that's bearings.
There are 3; pinion and two shaft bearings. You are going to want new seals, too.
949 Racing sells a kit for about $225
http://949racing.com/miata-diff-bearing-seal-kit.aspx
It is a bit involved and I wouldn't do it myself. I would start looking for a shop that specializes in differentials. Best guess, it's going to run you ~$400-700. Call around, though.
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