Series 1330 is a wider joint on the same cap diameter as 1310, which is exactly why the two get confused. A transmission yoke slides onto the splined output of the transmission or transfer case and carries the front joint of the driveshaft.

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T2-3-10201HP transmission yoke
$207.20
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1330
30/31 X 1.391
7.000
0
1.886
Forged Steel / Black Oxidized / CHROMOLY
T2-3-12051HP transmission yoke
$212.65
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Min: 1
Step: 1
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1330
26/27 X 1.176
6.750
1.218
1.500
TH700 / Forged Steel / Black Oxidized / CHROMOLY
T2-3-5981HP transmission yoke
$212.65
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Min: 1
Step: 1
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1330
27/28 X 1.220
5.906
0
1.500
C4 / Forged Steel / Black Oxidized / CHROMOLY
T2-3-14061HP transmission yoke
$212.71
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Min: 1
Step: 1
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1330
27/28 X 1.220
6.630
0
1.600
C4 / Forged Steel / Black Oxidized / CHROMOLY
T2-3-10831HP transmission yoke
$213.33
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Min: 1
Step: 1
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1330
31/32 X 1.378
6.750
0
1.886
Full spline, 1988-96 GM trucks/SUV's / This Yoke is Forged Steel and Black Oxidized. / CHROMOLY
12

Count the splines on the output shaft and measure across the spline tips. The same series serves many different spline configurations.

The transmission yoke is the driveline component that engages the gearbox output spline. On many vehicles it also acts as the slip member, allowing the shaft to change length as the suspension moves, in which case the seal surface and the yoke length both matter alongside the spline data.

Series determines the u-joint the yoke accepts. Spline count and spline diameter determine which output shaft it will actually go onto. Both have to match.