U-Joint Identification | Types of U-Joints Explained

U-Joint Bearing Cap Sizes

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When discussing the various bearing cap sizes of a U-joint, it's important to note that the measurements between different U-joint cap sizes are minimal and can be difficult to confirm using a tape measure or ruler. Therefore, we recommend using a set of calipers for precise measurements. But what exactly is a bearing cap on a U-joint? The bearing cap, sometimes referred to as a bearing case, is located at the end of each leg of the main U-joint body in a standard single cardan U-joint. These bearing caps feature a machined pocket that holds hardened needle roller bearings (along with grease), allowing the cap to rotate around the U-joint body. The bearing cap is press-fitted into the driveshaft yoke and is retained by internal or external snap rings. A grease seal is fitted onto the bearing cap to keep dirt and other contaminants out while retaining the grease, ensuring a long service life.

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Thank you for the responses. I think I have a good understanding of how to replace the U-joints. I appreciate the pictures and tips on using sockets, hands, and a mallet. It seems I will replace both U-joints on the front shaft. I will ensure to mark everything so that it can be reassembled in the same way it was taken out. Now, I would like to ask a couple more questions. Research indicates that non-greasable joints are typically more heavy-duty than greasable ones. Also, it appears that some joints are for driveline applications while others are intended for axle shafts. I would greatly appreciate a Dana Spicer part number for a set of heavy-duty U-joints for my front driveline, as that would be extremely helpful.

Sometimes, when in 4 high, I experience a slight rotational chatter or vibration. I was told this was likely due to my U-joints not accommodating the angle after being lifted. However, while under the truck, I could never determine the cause. I didn't find any binding issues. This is the reason I mentioned the high-angle U-joints. Additionally, I am concerned about what Patrick said regarding their speed limit.

On a side note, I have plans for a cut and turn in the future, and at that time, I intend to address a thicker, bigger, and stronger front driveshaft. My truck is off-roaded a couple of times a month, and as I gain more experience, I plan to undertake more adventures next season. For those who do not know, this is my first 4x4 vehicle, and I am a new driver venturing off-road this summer. So far, the Scout has gone wherever I directed it. My intention is to make it a capable mountain rig for exploration and camping. To date, it has never let me down. I always understood that issues would arise off-road, and parts of the truck that I had not yet attended to would need addressing over time. I believe this is what is happening now; older parts that have not been given attention are signaling me. I sincerely appreciate all the help; without you all, I would have lost my patience with this truck long ago. Thank you, Matt.