that being said, these cars run hot, STOCK, so why not cool the oil, my car runs hotter than my truck did, and a open rear end is a sin in any car, they should all be posi, or a locker. having a open diff is just cheap engineering if you ask me.
over heated oil just breaks down faster too. keeping all your fluids cooler helps all the components of your engine running longer., just like a trans cooler, why run the trans at 210, if you can run it at 175 or lower? same plan different fluid.