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
* 1310 Ford & 1330 Ford have 1 1/8” cap at pinion yoke and 1 1/16” cap at driveshaft. ** 1415, 1485, 1555 only found on Chrysler and some GM vehicles with American Axle built driveshafts.