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Need help figuring out a driveline noise

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  • Need help figuring out a driveline noise


  • #2
    I have a 97 base model S14 It has 40k original miles at the moment.
    it has the stock KA engine; for the past year i have been working on it, on & off.

    I started with upgrades by installing nismo engine mounts & Peak perf. trans urethane mount as well as nismo clutch & nissan motorsport lightened flywheel. after doing this everything was cool; no weird noises.

    Then i took the suspension apart & replaced all the rear subframe & diff. mounts with the nismo mounts & converted my rear knuckles with z32 units as well as, all new o.e. hubs & bearings.

    While i was working on the subframe I also installed a Ishihara crank scraper & verified the engine ran as normal with no abnormal noises.

    I also sent my diff. out to have it, regeared with nissan motorsports 4.364 ring & pinion & a new quaife diff. with all new bearings it was proffesionally installed by an X-Nissan motorsport rear end mechanic.

    After i installed everything i torqued every bolt & nut to spec. I drove the car & noticed & rattling, almost dog gear resonant sound when deccelerating from any gear between 2k & 3k r.p.m.; while the car is in gear only. I raised the car on a lift & verified everything is to spec. I removed the driveshaft & ran the car in the air to see if the noise is comming from the engine or trans. all good.

    I inspected the driveshaft joints & found them to be worn out. Had the driveshaft rebuilt & balanced.

    The noise is still there. I am running out of ideas. My next step is to disconnect the halfshafts & run the car in the air to simulate driving; in order to narrow it down to maybe an issue with the diff. setup.

    Or maybe thats just how it is, due to the harder subframe & diff. bushings.

    Has anybody experienced this???

    Please help

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    • #3
      If the noise only happens when it's in gear, then obviously it's in the drive train. I'd put my $ on the diff. rebuild.

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      • #4
        I have the same thing from when I did my 5 speed swap... think it the clutch. How stiff is yours? My transmission guy said the springs in mine are either too stiff or too soft... poor R&D skills if you ask me

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        • #5
          Originally posted by Bumnah View Post
          I'd put my $ on the diff. rebuild.
          Right now, I would too.

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          • #6
            If you can make the noise happen in the air, with everything connected, use a mechanics stethoscope to narrow down the noise. But just hearing what you have said, I would put my money on the diff as well.
            www.trivalleyautomotive.com

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            • #7
              Did you change to a short-shifter along the process? May sound stupid, but my B&M short shifter RATTLES like crazy on decel. Could be something simple?

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              • #8
                Originally posted by DuckyD View Post
                Did you change to a short-shifter along the process? May sound stupid, but my B&M short shifter RATTLES like crazy on decel. Could be something simple?
                Damn, didn't think of that. Mine is noisy as hell on decel as well.

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                • #9
                  Can you feel the noise? Did you replace the carrier bearing for the Driveshaft?

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                  • #10
                    The B&M rattle is a pretty unique sound, plus you can actually hear it coming from the shifter area.

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                    • #11
                      Harmonic vibration of the diff caused by the springs in the clutch disk being the wrong stiffness. Between 2-3k RPM on decel hits the diff's natural frequency, and you hear/feel it.
                      '18 Chevrolet Volt - Electric fun hatch for DD duty!


                      DefSport Koni Sleeve and Spring Perch Buy!!!
                      http://www.nissanroadracing.com/showthread.php?t=5902

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                      • #12
                        Originally posted by Def View Post
                        Harmonic vibration of the diff caused by the springs in the clutch disk being the wrong stiffness. Between 2-3k RPM on decel hits the diff's natural frequency, and you hear/feel it.
                        Who called it? Just in the wrong location haha

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                        • #13
                          Thanks for the replies

                          when i was still driving the car i installed a B&M short shifter & noticed the rattly sound you guys are referring to; i replaced it due to the noise & also synchro grinding it creates; i used it for about a couple hundred miles. I installed a nismo shifter which is basically like the stock unit except it has harder rubber in the lever.

                          yes i replaced the center bearing on the driveshaft with an o.e. bearing.

                          its hard to say if i can feel it, especially having the harder bushings & you know how these ka engines tend to produce certain resonances
                          but definitelly i can tell its coming from behind me.

                          also i understand that the noise gets transmitted thoughout the driveline.

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                          • #14
                            Originally posted by 98koukile View Post
                            Who called it? Just in the wrong location haha
                            I've been preaching this for over 3 years now. I even proved it by changing out my unsprung ACT 6 puck disk to a stock SR clutch disk with everything else in the car the same. Noise almost completely went away, where as before people would ask if I needed to call a tow truck as soon as I lifted off the throttle. Now you can just barely pick up a hint of it in 4th gear(the worse one since it's 1:1).
                            '18 Chevrolet Volt - Electric fun hatch for DD duty!


                            DefSport Koni Sleeve and Spring Perch Buy!!!
                            http://www.nissanroadracing.com/showthread.php?t=5902

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                            • #15
                              hey guys i wanted to mention that originally when the diff. was out & i was having the ring & pinion installed i had a new nismo lsd installed along with it, i pulled the diff out so i could have the diff. guy check the setup because of the noise in question then decided to go with a quaife & here i am with the same noise

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