My boss just got a 2008 Ford F450 Lariat 4x4. The manual calls for Motorcraft Transfercase Fluid.. Is this just a renamed overpriced bottle of atf at the stealership? Or do I really have to go to Ford and buy myself a couple of these quarts? I'll be changing the transmission fluid anyway so couldn't I just use the leftover atf? (I'll be using Maxlife Dex/Merc because its the cheapest atf I can find spec'd for Mercon SP according to their website)