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Clunk when accelerating in reverse 700 1989

posted by  jjelonek on  Mon Jun 3 12:15 CST 2002
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Hello,

I have a '89 760 Turbo, woo hoo! Anyhoo, when accelerating in Reverse, there is a single clunk in the rear. Is this dangerous? I hear that this may be the bushings, perhaps a loose screw. If so, how do I check the tightness of the screw? Where is it exactly?

Any advice is much appreciated.

Thanks,

Jason








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    Clunk when accelerating in reverse 200 1987

    posted by  Mikeypoo on  Mon Jun 3 12:29 CST 2002
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    I know differentials in general and have just finished assembling a corvette diff... i think the clunk you are referring to is "backlash" or play between the pinion and ring gears. When you put it in reverse, the ring gear is actuated on the other side of the teeth as when you have it in forward, and the "clunk" is the pinion gear hitting the ring gear. If tolerances are tight, you will not hear this noise. I don't konw what they are supposed to be.. a Vette differential backlash,for example, is between .006 and .009inches. Dana 44 truck differentials are between .01 and .015. Good luck!






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