(Three attempts made using the AMSOil online/web form, no response :( )
I have a 1973 Ford F600 truck, 361 FT engine, 23,000 GVWR.
The transmission is a 5-speed Clark 282V36.
My understanding is that oil spec for the transmission is SAE 50, Ford spec. ESE-M2C39A for >0°F operation. From the...