What stock ratios where available for 1951 f1 and what year center sections are interchangeable? I would like to avoid going with a 9" but get highway rear grears.
Thanks
Pete

 

4.27:1 and 3.73:1 49,50 & 51.

 

3.92 in most of mine, 51 and 52s

 

Here's the 1951 Rear-end Specifications Table:






3.73:1 was particular to the 48-50 models. 50-55 MPH is about the best you will do at about 3000 rpm with a stock high gear rear end. Not at all good for sustained freeway speed - maybe 15 to 20 minutes.