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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 10-16-2008   #1 (permalink)
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Default Need help with transmission identification

C5AP 7006 ---- I assume it's a 65 automatic but is it a C4?
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Unread 10-16-2008   #2 (permalink)
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Yes, that number is for a C4 automatic transmission case used on the 240L6 and 289V8.
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Unread 10-16-2008   #3 (permalink)
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C5AP-7006 is the component ID or engineering number. It was designed in 1965 and 7006 is the component number for the trans. housing on a Borg Warner FMX. It should be made of cast iron. This trans has a separate bellhousing like the C4. The C4 has an aluminum trans housing.

The component number 7005 is for the C4 housing. Ford uses the two numbers 7005 and 7006 for transmission housings. The factory exploded views designate the trans housings on the C4 and C6 as 7005 and the FMX housing, 7006 for some reason. If these numbers conflict, all that I can say is, that's typical with Ford numbers. Confusion abounds!

There is/was a small tag attached to the driver's side servo cover which contains the transmissions ID on the C4 and C6. The FMX has the tag attached to one of the bolts holding the extension housing.

Just because a component was designed in 1965 doesn't mean that that cast in or stamped number won't appear on a later model car. The year will change when there is a modification or redesign done to the component in a different year. The metal tag is the only way to positively ID the transmission.

If you find an ID tag attached to the driver's side of the trans. and the housing is cast iron, it's an FX or MX Borg Warner unit. These automatic transmissions were not used on Mustangs.
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Unread 10-16-2008   #4 (permalink)
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If the tranny has a 15 bolt pan it's an FMX, an 11 bolt pan is a C4. That's a very quick and easy way to tell. The C4 does have an aluminum case, as The Greek stated, and the FMX is iron. Placing a magnet on the side of the case can help you identify the material. If it sticks, it's iron.
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Unread 10-16-2008   #5 (permalink)
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Thanks,.........You guys are awesome!!!! When I figure out which one it is I need to sell it along with a top loader 4 speed. Thanks again
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