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clunck from the rear

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Old Nov 11, 2014 | 07:23 AM
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Default clunck from the rear

Hey guys,
I have just under 53000 on the clock (06 gto). Never been to the drag strip but have had plenty of wheel hop from doing 40rolls over the years. I have noticed some whine coming from the rear about a month ago.I thought it was from taking out the rear seats, made sense to me.
Just last week I changed the trans fluid with napa dex 3 and rear diff fluid with lucas gear oil. Thought it was time for some up keep.
Now I have a big clunck from stop to first and a vibration when stop to first mid turn, like at an intersection. Is it my gears? Axles? Drive shaft? I figure its the dif bc it vibrates mid turn. I'd like to get your input before bringing it to a mechanic who might not no squat about my car but act like he nos everything and miss diagnosis it.
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Old Nov 11, 2014 | 07:40 AM
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I am not sure about your '06 GTO but my '00 T/A called for posi additive when I changed the axle lube. I used the GM posi additive and Valvoline full synthetic 75w-90.
When I changed out the tranny fluid, I used valvoline Max life, which is good for all versions of Dex. So far, I have no issues.
Tranny Thread

Last edited by bgw70; Nov 11, 2014 at 07:46 AM.
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Old Nov 12, 2014 | 07:36 AM
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@bgw70@
You are the man.thank you so much. I added the additive , drive around and it is completely gone now. big thank you.
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Old Nov 12, 2014 | 01:09 PM
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Originally Posted by 06gtoLD
@bgw70@
You are the man.thank you so much. I added the additive , drive around and it is completely gone now. big thank you.
That is Great News!!! Glad to hear it was an easy fix...you are very welcome!
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Old Nov 15, 2014 | 02:40 AM
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Wow, I had no idea that additive actually did anything! I heard it made the posi slip a little bit but never thought there would be a clunk without it.
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