Recent content by bigcart

Thank you for the reply. This is what I am thinking as well. While I know that this particular transmission won’t be too picky, it’s good to know this would be a good protocol for other transmission calling for ATF. If you wanted to you could dial in the viscosity by mixing different MTL...

Redline MTL in my post was referring to the original 75w80 GL-4.

Recently picked up a 91 F150 with the inline 300 and M50D and would like to change the transmission fluid. Original spec called for Mercon. Motorcraft Mercon V and Valvoline DexMerc are the closest things I could reference for viscosity, resulting in 33.2cst @40 / 7.5cst @100 and 34.5cst @40 /...