Metro Auto Parts Market
Ford Rear End Catalog
Hot to Select Axle and Measure the Companion Flange
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How to tell whether yours has a 28 or 31 spline axle.
This method works for pre-1971 axles, after that a few 31 splines
were produced with the concave oval in the center of the flange.
Therefore, the only foolproof way is to remove the axle and count.
Note all 8 inch units use 28 spline axles

28 Spline Axle

31 Spline Axle
Note the concave oval area
in center of axle flange.
Early 28 Spline axles are tapered.
Counter sunk holes in center
indicate a 31 spline axle.
31 Spline axles are uniform in diameter.
How to determine the width of the yoke.
Shown is a 3 1/ 4" Saddle (1310)
You will be measuring the saddle width (where the u-joint cups fit into the yoke).
The measurement will be either 3 1/4" (1310) or 3 5/8" (1330) or (1350)
The 1310 yoke is the most common with the 1350 almost never found in production car driveshafts.
1310 Yoke 
Width 3 1/4"
 Cup diameter of U-joints 1/16"
1330 Yoke
Width 3 5/8"
 Cup diameter of U-joints can be either 1/16" and/or 1 1/8 inch"
1350 Yoke
Width 3 5/8"
 Cup diameter of U-joints 1 3/16"
How to determine whether you have a
Standard or Daytona pinion support.
3 1/2 " Yoke - Daytona Support
4 1/2 " Yoke - Standard Support
The exposed portion of the companion yoke will measure either 3 1/2" or 4 1/2".
Note that the measurement is taken with the companion flange installed in the housing.
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