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    Looking for a diff(erential)

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    • HoustonRunner
      HoustonRunner last edited by

      So I'm close to finally pulling the trigger on a new diff for the E28. The driveline whine is bugging me enough, I'd prefer an LS unit, and I'd like a bit more "go" off the line. Current diff is a non-limited slip 3.25. It also may be leaking a drop every week or so.

      Luckily BMW used that same diff for a long time in a number of cars, all the way through the Z3 (6 cyl). I'm still looking at $600-800, unless I can find one locally. (Turns out shipping a heavy hunk of metal isn't cheap.) I'd like to get something in the 3.64 to 3.73 range, 3.91 is probably ok (I don't do much highway driving), but I don't think 3.46 would be enough to feel much of a difference.

      Also, after seeing listings for shims when I search for diffs on ebay, I did some investigation and realized my driveline noise may be due to incorrect lash settings on the diff. I guess being off by even a mm can cause the type of driveline whine I've been hearing.

      I know we have a couple of current and former E28 owners in the oppo-verse - any chance one of you has a line on a diff that would work before I scour ebay?

      (Just now looking at this picture, and probably could use a new diff mount as well.)

      IMG_20200419_120709.jpg

      2015 Suburban 4WD / 1988 BMW 535i (manual) / 1988 Suburban (#squarebody)

      Bandit 1 Reply Last reply Reply Quote 0
      • Bandit
        Bandit @HoustonRunner last edited by

        @houstonrunner Have you tried car-part.com? It's a website that just shows you parts that junkyards have available. I've found the prices to usually be 3-4x less than if you were trying to by another used part off ebay

        1981 Pontiac Trans Am
        1993 Chevy Corvette
        2019 GMC Canyon

        HoustonRunner 1 Reply Last reply Reply Quote 3
        • HoustonRunner
          HoustonRunner @Bandit last edited by

          @bandit said in Looking for a diff(erential):

          @houstonrunner Have you tried car-part.com? It's a website that just shows you parts that junkyards have available. I've found the prices to usually be 3-4x less than if you were trying to by another used part off ebay

          I have not, but will now for the next 15 minutes at least...thanks.

          2015 Suburban 4WD / 1988 BMW 535i (manual) / 1988 Suburban (#squarebody)

          HoustonRunner Bandit onlytwowheels 3 Replies Last reply Reply Quote 0
          • HoustonRunner
            HoustonRunner @HoustonRunner last edited by

            @Bandit Well, that was quick. No locking diffs from my search. Thanks for the tip though, will come in handy at some point.

            2015 Suburban 4WD / 1988 BMW 535i (manual) / 1988 Suburban (#squarebody)

            1 Reply Last reply Reply Quote 0
            • Bandit
              Bandit @HoustonRunner last edited by

              @houstonrunner said in Looking for a diff(erential):

              @bandit said in Looking for a diff(erential):

              @houstonrunner Have you tried car-part.com? It's a website that just shows you parts that junkyards have available. I've found the prices to usually be 3-4x less than if you were trying to by another used part off ebay

              I have not, but will now for the next 15 minutes at least...thanks.

              It has that awfuly 90s UX design and the search features are kind of clunky so you may need to try searching for known interchangeable vehicles until you find what you need

              1981 Pontiac Trans Am
              1993 Chevy Corvette
              2019 GMC Canyon

              HoustonRunner 1 Reply Last reply Reply Quote 0
              • HoustonRunner
                HoustonRunner @Bandit last edited by

                @bandit Gotcha, don't expect it to be "smart" in any way, shape, or form.

                2015 Suburban 4WD / 1988 BMW 535i (manual) / 1988 Suburban (#squarebody)

                HoustonRunner 1 Reply Last reply Reply Quote 0
                • HoustonRunner
                  HoustonRunner @HoustonRunner last edited by

                  @Bandit Aha, that may be the ticket, seems to be one in Austin for $450...

                  2015 Suburban 4WD / 1988 BMW 535i (manual) / 1988 Suburban (#squarebody)

                  1 Reply Last reply Reply Quote 2
                  • onlytwowheels
                    onlytwowheels @HoustonRunner last edited by

                    @houstonrunner

                    Also try:

                    https://www.hollanderparts.com/

                    1 Reply Last reply Reply Quote 0
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