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Ford I-Beam Axle 
Ford Tube Axle
Original Ford Axle Dimensions
| YEAR | WIDTH | RADIUS ROD CENTRES | COMMENTS |
| 1928-31 | 51-7/8 inches | 36 1/4 inches | |
| 1932 | 51 3/4 inches | 36 9/16 inches | |
| 1933-36 | 51 3/4 inches | 36 9/16 inches | i beam is thinner than 32 axle but dimensions are the same. |
| 1937 | 50 inches | 38 1/2 inches | Tube axle |
| 1938-41 | 49 7/8 inches | 38 1/2 inches |
| 1942-47 | 52 inches | 40 3/4 inches | |
| 1948 | 52 inches | 40 3/4 inches | extra hole in beam for shock |
| | | Perch bosses are 2 inch this for 1932 to 36 |
| | | Perch bosses are 2 1/4 thick for 1928-31 axles as well as 37 to 1948 |
To keep wheels under fenders
'28-34 Short I-Beam 46" 34-1/4"
'35-48 I-Beam 47-1/2" 38-1/2"
'42-48 Long I-Beam 50" 40-5/8"
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