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