C4 pump swap

Hi, I was just wondering are C4 pumps interchangeable throughout the years? If not, what are the differences and how do you determine what will work? Thanks for the help. Craig

FD C4F Catalog: PUMP ASSEMBLY, Main

Basically, you have 64-66 using small input and o-ring seal, 67-69 using small input and gasket; and 70 up using large input. As long as you stay within those groups they all interchange.

Yes but what about the actual pump body? The input shaft differences etc can be changed by removing/unbolting the stator support.

I have looked and seems the 66-69 pump bodies are the same as 70+ but not 100% sure

Originally Posted by gregaust

Yes but what about the actual pump body? The input shaft differences etc can be changed by removing/unbolting the stator support.

I have looked and seems the 66-69 pump bodies are the same as 70+ but not 100% sure

FD C4F Catalog: PUMP BODY, +Gears

Even though there are 3 different casting numbers, I believe all you need to worry about is whether a gasket (67-86) or o-ring seal (64-66) is needed.

Ok sounds good . Other tah nth o'ring type all others are same.
One thing i have noticed though is the EO castings i've had have no converter pressure relief (valve with little pushin clip) valve in them. Doesn't seem to make any difference though.