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Location: Prince Albert, Saskatchewan
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The friction modifier is what you add to gear oil that doesn't already have it. If you don't want to deal with adding or mixing anything, the gear oil you want to use is 75W-85 GL-5 ZF LSD, Mopar part number 68083381AA. That's the the stuff the TSB said to put in to quiet the noise (Apparently some had the wrong fluid put in from factory, which may be your case). It has the right amount of carbon clutch additive in it already. It's not cheap but at least it won't take more than 2 liters. Then it's as simple as drain and refill.
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// 2016 Dodge Challenger R/T Scat Pack 392, TR-6060, Billet Silver, SPAG
Last edited by BlackHemi41; 12-23-2018 at 06:58 PM.