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Thanks everyone. It sounds like I can go with a lighter weight oil, but will definitely either add Zinc additive or look for an oil with it. Regarding the transmission, it was also rebuilt at the same time but that was 5-6 years ago and I am the third owner since the restoration. I have no idea...

Thanks for the quick replies! I have no idea what kind of lifters are in the engine following the rebuild, so should I plan to use some zinc additive as a precaution? The engine has a little over 4k miles since the rebuild so I don't think I would need any special break-in oil.

Hi all. I am new to the early Bronco and just picked up a new-to-me 1974 a few weeks ago. I have some small leaks coming from the oil pan gasket and transmission pan gasket (C4) and plan to replace the gaskets. I want to make sure I am using the right fluids for my application. My Bronco has an...