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Old 11-25-2015, 12:51 AM
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Rear end

I have a 02 wj with quadra dirve and after driving for awhile the rear makes like a grinding noise and rough ride when turning slow,does anybody have any ideas?

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  #2  
Old 11-25-2015, 05:35 AM
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Re: Rear end

Sounds as too low friction modifier in the rear diff fluid. If not changed lately, i would do it now and add the right amount of friction modifier to the fluid. If you did change the fluid, then add some friction modifier.
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Old 11-25-2015, 09:03 AM
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Re: Rear end

Thanks Firestone just changed axle seals,how much do I add and what kind
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Old 11-25-2015, 09:25 AM
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Re: Rear end

Normally 4 ounces in the rear diff should be enough. Sometimes an already pre-mixed lubricant is used, but its known that it can have not enough friction modifier. So good to know first what they used, before pooring the total amount of 4 ounces in. If the diff is full, you will need to drain some fluid, before you can add the modifier.
After adding the modifier, you will need to do tight figure 8 turns on some empty parking lot or any other suitable space, so that the modifier will be mixed and taken inside the Vari-Lok. It will prevent full lock of the vari-Lok, which is necessary when making (tight) turns and both wheels on the same axle will have different speeds.
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Old 11-25-2015, 09:37 AM
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Re: Rear end

Thanks I will try to find out how much they used and go from there.Thanks for the reply
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Old 11-26-2015, 08:06 AM
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Re: Rear end

Simple, dump the garbage Firestone uses. Pour in the 4oz into your prefered synthetic lube and fill
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Old 11-26-2015, 08:07 AM
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Re: Rear end

Simple, dump the garbage Firestone uses. Pour in the 4oz into your prefered synthetic lube shake like a Martini, and pour into diff.
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Old 11-26-2015, 04:31 PM
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Re: Rear end

Thanks, that is what I was thinking of doing anyhow after the experience I had with them I know that I will never go back there again
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Old 11-26-2015, 07:26 PM
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Re: Rear end

I only use them for my lifetime alignment
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