Re: Transmission Identification
The 1A-7006 (gearbox casting number) suggests that this is a 1951 Ford passenger car trans. Those were all R10 overdrive units. Not sure what the 390 represents since they all had the 27 tooth cluster gear (2.78:1 on first gear). There are other physical ID charactoristics that would confirm the 1951 vintage. Its usefulness depends on what you want it for. Is it the correct input shaft spline? Tailhousing mount in the right location? Etc.
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