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05-31-2020, 03:17 PM | #1 |
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Location: Missouri
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55 F100 U Joints
Replaced the U joints in my pickup. The U Joint at the yoke end is very close to the yoke end cap. It hardly rotates at all, because of the minimal clearance between the yoke and u joint. It does rotate the opposite way. I have never seen this situation before. I am wondering if I should take it apart and do something with the yoke cap, or if it needs to move during operation will the cap just deform as required? Thanks
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06-01-2020, 05:54 AM | #2 |
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Re: 55 F100 U Joints
The original u-joint had an offset to the cross that allowed the plug to clear. The replacement u-joints have a symmetrical cross that bumps into the original plug, as you found out. The solution is to take it back apart and drive the original plug out. Replace it with an expansion plug (slightly convex -dished shaped). They are set by hitting them in the center with a blunt brass punch and heavy hammer. If you can’t get it to seat tightly you can tack weld the plug. I don’t have the size for the plug handy so you’ll have to check that.
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06-01-2020, 08:34 AM | #3 | |
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Re: 55 F100 U Joints
Quote:
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06-01-2020, 09:05 AM | #4 |
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Re: 55 F100 U Joints
The plug is there to prevent trans lube from running out along the splines.
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06-01-2020, 06:43 PM | #5 |
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Re: 55 F100 U Joints
The original plug is a pressed steel part and can be driven out from within the splined part of the yoke. Of course , you’ll need to remove it from the transmission and remove the u-joint as well before you hammer the plug out. You can also push it out with a hydraulic press if you have one.
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06-01-2020, 09:24 PM | #6 | |
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Re: 55 F100 U Joints
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06-02-2020, 09:56 PM | #7 | |
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Re: 55 F100 U Joints
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06-03-2020, 08:42 PM | #8 |
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Re: 55 F100 U Joints
Bear in mind, the splined output shaft of your transmission should be thoroughly greased, because that yoke will slide back and forth on the shaft as you go over bumps or load down the bed of the truck.
If that metal plug is gone, you will fairly quickly push the grease out thru the hole you just made. That plug, keeps the grease in. |
06-03-2020, 09:36 PM | #9 | |
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Re: 55 F100 U Joints
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06-10-2020, 07:22 AM | #10 |
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Re: 55 F100 U Joints
Just an update..I used a 1 5/16 concave freeze plug to replace the old plug. It worked like a champ, fit just right. Used a press and some sealant. Thanks for all the help.
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06-14-2020, 09:16 AM | #11 |
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Re: 55 F100 U Joints
Here is the clearance with the new plug installed. Big difference.
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