Quote: The "5" denotes that the engine is for an automatic trans....regardless of engine type.
Which, as Dan said above, makes sense. So what is the code for a manual transmission and how does that relate?
The 3 digit engine number is the last 3 numbers of the part number for that Engine Assembly. On the other side....an automatic trans equipped car would get either a 5, a 25 or a 125 depending on year etc. This number is based on the Engineering number for the Kick-down linkage. That is why standard transmission cars have a "0" on the v/cover....no kick-down linkage.
