[Brads65]

I have a 1965 Mustang Convertible with a 1966 289 engine. The transmission doesn't have a date plate on it, is there another way to figure out the year and information of the transmission. There is a number on the top of the casing that is stamped in. The # is 8R511005, does that mean anything? Thanks for any help you can give.

[MizzouMike76]

Brad,

I have no idea how to find info for your transmission. I just hated to see any post go unanswered. Hopefully by bringing it back up to the top, someone will take notice.

Cheers,

Michael

[Jay H 237]

I looked in my Ford parts interchange manual but that stamped number isn't mentioned. The manual goes by the ID tag which is missing on yours.

[The Greek]

You need to look for the casting code on the trans housing. It looks just like a ford part number. The first two letters/number will ID which year trans it is. For example C= 1960s D= 1970s The second number is the year in the decade. C6= 1966.

Check these sites out.
General info and ID http://www.mustangcentral.net/tech/c4.html
Bellhousing application chart http://mmerlinn.tripod.com/trans/fdc4f/fd9c4bhd.htm
C4 numbers and nomenclature http://mmerlinn.tripod.com/trans/fdc4f/fbbfdc4f.htm#nom
Chris Kelly's tranny page with links Kelly hotrod - Ford C4/C6 transmission data and links