Galen's book is wrong on 62 and 63 max wedge trannys. 007 is the correct number for 63 model year cars. 007 was used in the 300J along with 63 max wedge cars. the second number is not a date code either as Galen has always suggested. It is simply a continuing assembly number that is carried on year after year. the C suggests it was assembled in the second half of the 62 calendar year. a D in front of it would indicate the first half of 63. then E and F would be the 64 model year, G and H would be the 65 model year, etc. I think your tranny could very well have been out of a 300J that was likely assembled late in 62 or early 63. it would fit a lot of max wedge cars built around the same time frame. it should be worth at least 500 hundred dollars to someone trying to make a maxie as correct as possible.