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Hissing/dragging mystery noise from rear end, stumped!

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    #16
    Originally posted by MTechnikII View Post
    as far as I know the automatic cabrios came with 4.10 open diffs, there might be other difes on different year models,
    mine is a 1991 plastic bumper automatic
    Henry
    That makes sense. I'm 5 speed.

    -MM

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      #17
      Could be brake pad drag. If the sliders are sticking or if the caliper piston seal is sticking to the piston (stuck corroded bore) the pads will drag on the disc. Happens frt and rear. The rears are easy fix. If Girlings on frt. Pita. There is a technique for the piston gaiter on Girlings. If u dont follow you will be chimping, Grasshopper. Seems as though disc runout would alleviate the problem but sometimes it dosnt.

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        #18
        4.10 open here as well.

        Before I started replacing anything other than the diff oil, I'd take a close look at the e brake. If its adjusted that poorly who's to say it was installed right. It's not uncommon for the shoe retaining pins to corrode or pop out which could easily cause a noise such as you describe.
        Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

        https://www.r3vlimited.com/board/sho...86#post4944786
        Alice the Time Capsule
        http://www.r3vlimited.com/board/showthread.php?t=360504
        87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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          #19
          A dragging/scraping/hissing noise from the rear wheels that doesn't go away with application of the brakes or parking brake won't be from dragging brake shoes or pads. It could be from something in the parking brake mechanism, which should be obvious once you pull the rotors. If not from the brakes or backing plates, the next most likely cause is a bad wheel bearing. A bad bearing in the differential is a possibility, but I'd change the wheel bearings before messing with the differential.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

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            #20
            I feel your pain OP. I have the same noise and have changed the diff fluid, wheel bearings rebuilt calipers, changed brake lines, and still have the same noise. My next step is guibo and center bearing, and if that doesn't work i will change the differential for another.

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              #21
              Same issue here. Changed rear wheel bearings, diff oil, rear brake pads and rotors, e-brake shoes, center support bearing and still have a noise :/
              PNP Adapter Harness Wiring for M52TU, M54, S54, M60, M62, M62TU, S62, M50, S50, M52, S52 & MORE

              sigpic

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                #22
                Please keep this thread going! I'm concerned about a similar sound--it speeds up and slows down with the car. Rear rotors and brakes are brand new. Haven't looked at the e-brake, but I don't think it is too badly out of adjustment. I replaced a front wheel bearing, so I am suspicious of all the bearings at this point.

                The guy I bought it from was not entirely truthful about its condition, so if something major were wrong like the rear diff, that kind of fits why he was selling it.
                '90 zinno 325iS

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                  #23
                  My diff sounds like a swimming pool pump.
                  sigpic
                  Reich und Roll!

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                    #24
                    If the whine is related to LOAD and throttle position and will still make a rumbling in neutral while coasting in neutral...............


                    usually the diff pinion RACES x2 will have worn and the 2x related bearings are dying.
                    the entire load of the car is put on these 2 bearings/races.

                    a slight amount of metal in drained differential oil will show this;
                    OBD1 M54/M52TU swap as a M50b25

                    Z4 non powered steering rack fits e30



                    Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

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                      #25
                      Unscrew the axle from the diff, start the car and put it in gear while its on jack stand. If its still noisy, its the diff. If not its the wheel bearing.
                      Bought parts from me before? leave your feedback here

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