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Quality of Rear Diff. Mounting Bushings

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  • Quality of Rear Diff. Mounting Bushings

    Been away for a while--restored a '74 MGB (now my daily driver).

    QUESTION: I have read that the metal sleeves in modern diff. bushings have been prone to work loose from the rubber. Please share your experiences/knowledge, as I begin to hunt down the "clunk" in the rear (occurs when letting the clutch out either from a stop or moving). Note: diff. NOT rebuilt, all new U-joints, all new rubber diff. mounts, original Armstrong shocks, mounting points "boxed in", Richard Good half shafts, wire wheels & hubs new, etc.). It may be that I'll just have to go through everything all over again. FYI, less than 2k miles on restoration with gentle driving only--problem developed gradually.

    Thanks.

  • #2
    It's pretty easy to check since the rear mounts can be removed one at a time. The differential itself won't be going anywhere. That's how I found the clunk even after having the front mounts brackets boxed in.
    If the metal sleeve in the center of the rear rubber mount has broken free of the surrounding rubber, you'll discover it when you remove the mounts...but the noise might just be that the planet gear thrust washers ( Moss 674--760) are getting a little thin.

    Driving a 1973 TR6
    Doing ZS carb repairs
    email kencorsaw"at"aol.com

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    • #3
      Just had this happen on mounts that had done less that 3000 miles.. caused a clunk and a vibration at part throttle at 70mph.. have fitted another set from a reputable supplier.. if these go the same way then its poly bushes (although they are expensive!)..
      One question however.. if the setup "clamped" the bush between the dif and the chassis (like they do in the front) wouldn't this be a better setup?
      Cheers
      Tim

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      • #4
        I don't know,Tim; I went back with poly on the rear, keeping the original type rubber on the front.
        Driving a 1973 TR6
        Doing ZS carb repairs
        email kencorsaw"at"aol.com

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        • #5
          Sloppy spider gears can cause this also.

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          • #6
            Poolboy,

            I was "playing around" with the diff. and found more noise (same amount of wheel play as other side) coming from the LH side wheel/shaft. This lead me to question the integrity of the fiber washers inside, especially on the LH side. An engineer friend who has rebuilt a TR6 diff. is going to look at it and offer his opinion.

            Thanks for the suggestions, guys.

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            • #7
              I went with poly ones after I had this happen. Less than 1000 miles and complete failure of the support ring. Was never correctly manufactured. Lucky it failed at low speed on a side street, nearly dropped the Diff on the street.

              ​​​​​​​
              ‘70 TR-6

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              Quality of Rear Diff. Mounting Bushings

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