The majority of the reason for the overheating issue is due to the tolerances things come preset at from the factory. There is a fair amount of variation, that really should be tighter, but for an OEM part being used in normal driving conditions, its not much of an issue. The OEM diff is absolutely useless once things get hot, and it's lockup% is not all that significant in the first place. It's why the aftermarket units provide an immediate, noticeable difference.
The diff cooler certainly helps on a full out race car running slicks. It's not something I'd invest in otherwise
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