Aston Martin DB7, DB9, DBS, Vantage V8, Vanquish, and Classic models

DB9 rear knock

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Old Mar 13, 2015 | 01:15 PM
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DB9 rear knock

I get a knock when gently setting off from 1-2. Its very intermittent and only usually happens in the first couple of minutes of driving. Rarely can get it to happen again after that.

It's usually with gentle acceleration.

Very much like this guy

http://www.amoc.org/forum/index.php?topic=30337.0

Anyone had this issue here? I stuck it on the ramp, the rear suspension looks fine and the tranny mounts like alright to
 
Old Mar 14, 2015 | 08:41 AM
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When is the last time you had the differential fluids changed? Fluid tends to stick the clutch plates and cause a binding mostly when cold. DB9 auto transmission differential only holds a small amount and can be contaminated easley.
 
Old Mar 14, 2015 | 09:09 AM
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Thanks for that, didn't even come across my mind and I have seen threads in the past referring to Diff fluid causing knocking issues. It has 106k on it and I'd be surprised if it has been changed more than once in it's life if that!

Quick and cheap to try so will report back in a couple of days!
 
Old Mar 23, 2015 | 04:29 AM
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Done a couple of hundred miles since the fluid change. 100% fixed. Thanks alot J doubleU.
 
Old Mar 23, 2015 | 08:57 AM
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Glad to hear it was an easy fix. Now you can keep up the maintenance schedule so it doesn't come back. JW
 
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