transfer case: https://www.amazon.com/dp/B0031BUW0I/?tag=fordraptorforum-20 differentials: https://www.amazon.com/dp/B000BRCT24/?tag=fordraptorforum-20 coolant: https://www.amsoil.com/shop/by-prod...ity-antifreeze-and-engine-coolant/?zo=1678239 I'm not a fan of the orange stuff. Apparently its a similar blend of what GM used on their trucks that would cause sludge over time. I only know because Land Rover used an old GM block for ages and thats what they used as well. Google dex cool sludge for more info. Plugs are worth doing as a preventive measure, but not required if you don't have any misses at this time.