Width: U joint: Please compress the caps and measure from outside of cap to outside of cap .

End Yoke: Please measure from inside of tab to inside of tab, using the picture above for reference, If you do not see a tab as shown, then you have an inside snap ring u joint.

Use the picture above for reference

Cap Diameter:
U joint: Simply measure the U-Joint cap diameter .
End Yoke: Please measure the width of the opening where the cap sits in the yoke. use the picture above for reference

Use the picture above for reference

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Common Outside Snap Ring U-joint Sizes and Series

Series	Width	Cap Diameter
1210	2 7/16″ = 2.438	1 1/16″ = 1.063
1310	3 7/32″ = 3.219	1 1/16″ = 1.063
1310 FORD*	3 7/32″ = 3.219	1 1/8″ = 1.125
1330	3 5/8″ = 3.625	1 1/16″ = 1.063
1330 FORD*	3 5/8″ = 3.625	1 1/8″ = 1.125
1350	3 5/8″ = 3.625	1 3/16″ = 1.188
1410	4 3/16 = 4.188	1 3/16″ = 1.188
1415**	4.178	1 3/16″ = 1.188
1480	4 3/16 = 4.188	1 3/8″ = 1.375
1485**	4.178	1 3/8″ = 1.375
1550	4 31/32″ = 4.969	1 3/8″ = 1.375
1555**	4.9464	1 3/8″ = 1.375