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Reverse knock sound mystery

  #1  
Old 10-02-2018, 11:46 PM
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Default Reverse knock sound mystery

Since 2016, my 2001 V70 xc has been emitting a knock when I reverse, often quite loud. About a full second after accelerating into reverse.

A transmission shop (2 fellows looking/listening to reverses) diagnosed multiple engine mounts. I replaced the lower one, which was sheared in half! But no change to knock.

Later, 2 different shops diagnosed the sleeve in the angle gear, i.e., worn teeth. But I am not convinced.

1. Could worn teeth impair reverse gear alone?

2. The angle gear is located beneath the driver, but the knock sounds like itís coming from the rear axle.

Opinions?
 
  #2  
Old 10-03-2018, 02:39 PM
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dunno about gears making knock sounds. I'd look at a) motor mounts b) transmission & differential mounts c) exhaust system hangers
 
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