I use the “Travelers” Brand for ford tractor transmissions available at Tractor Supply and it is reasonably priced. Same as previously mentioned. Sta-Lube is too pricey. I have used it also in the past, so I believe it is a good product but the other is easier on my wallet. I believe it is sold in 2 gallon containers. Just don’t tell your GM products what is is made for and they won’t know the difference.

I invest my money in precious metals, mostly rust!