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Thank you for the replies. Type F is still available, but I was wondering if the new "formulas" that weren't around "back in the day" might provide better protection and performance.

I have a classic truck, a 56 Ford with a 5.0L H.O. and a C4 Automatic. I don't know what the donor car was for either one, but it's obviously important that I maintain them. So, while I understand the recommended ATF was likely Type F back whenever this transmission was manufactured, I am...

Hey! Thanks to everyone for all the help. I am thinking the Castrol might do the trick. A person can really overthink this stuff, eh? John

Stalube makes a GL4 gear oil which states on the container for hypoid gears. https://www.crcindustries.com/products/api-gl-4-multi-purpose-gear-oil-1-gal-SL24239.html That's the product I used in the transmission and had planned to use it in the differential, but after collecting opinions of...

Thanks for the replies! Very much appreciated and some confusion is being addressed, GL-5 is the way to go in the differential. Now...what's your thoughts on using one of the many synthetic GL-5's in the differential? (along with the additive)

OK, I understand the importance of using GL-4 vs GL=-5 gear oil in the Muncie manual four speed transmission found in my 1968 GTO...protection of the yellow metals, right? But...how about the rear Safe-T-Track (posi) differential? Paralysis by Analysis is beginning to set in...I have read that...