trouble with vin decoder 1964 fleetside

[onebad98z]

Im new here and i like to say thanks for the site and wealth of information. I just picked up a pretty good shape 64 but when i run the vin thru american classics it comes up as a 66 the vin on the title is ddc1446z150211

the vin on the body matches it also except for the dd in the begining

im just trying to figure out what the original drivetrain was and stuff..


Here it is, I know the paint is a little loud but its solid...in and out

Thanks for taking your time,
Greg