Originally Posted by cobalt327
If the engine's running well, and seems to be getting better, I see no reason to not continue driving it.
Today's lubricants are a far cry from the crude (npi) lubes used in '40.
Eaton and CAT both use a 50w gear lube, but unless you learn something to the contrary I'd use a straight 50w motor oil.
You might want to ask over at P15 D24 forum
, they cater to the old MOPARs.
I ended up using an SAE80 gear oil, which is what seems to had been in there before, Once I get better clarification from some Mopar experts I will swap over to the SAE50 motor oil if needed. Im not driving the car much just testing around block to test brakes, cooling, etc. Thank You