Mike, almost all '47's had the borg warner OD transmission, check the left side of the steering wheel under the dash, there should be a maroon knob with a big O on it, those are a better OD than the Columbia 2 speed axle that was last used in 1941, you will love it. Check the numbers and letters on the heads of your engine, it may just have an A on them, pre war Ford, or 59A, postwar ford and merc, or 8BA, '49 -'53 Ford, or 8CM, '49-'53 Merc, there are some others that it may be, but let us know what the heads say-