Rear Axle drum to drum width:
NOTE: These width dimensions where measured with 1940 style brakes. Mechanical brakes may differ.
Year                  Width               Spring mount eye to eye
1928-1931            57.0"                     49.5"
1932-1934            57.75"                   47.5"
1935-1936            59.5"
1937-1941            59.5"                     48.5"
1942-1948            61.0"Stock Axle length
Year                  Length               Number of teeth
1928-1931         32.09                    24
1932-1934         32.18"                  18   (use 12 tooth spiders)
1935-1938         32.85"                  18   (use 12 tooth spiders)
1939-1941         32.85"                  16   (use 11 tooth spiders)
1942-1948         33.70"                  16   (use 11 tooth spiders)U-Joints
Spicer #         NAPA #               Dimensions
1310            210-0153         3-3/16 x 1-1/16
1330            210-0213         3-5/8 x 1-1/16 or 1-1/8
1350            210-0178         3-5/8 x 1-3/16
Combo joints
1310-1330   210-0134        
1310-1330   240-0356        
1330-1350   240-0448
1310-1350   240-0358MPH =       RPM * Tire dia (inches)      
             trans final gear * rear gear * 336

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