{"id":5028,"date":"2017-07-01T00:00:25","date_gmt":"2017-07-01T06:00:25","guid":{"rendered":"https:\/\/gmb.net\/blog\/u-joint-failure-modes\/"},"modified":"2025-08-22T07:16:48","modified_gmt":"2025-08-22T11:16:48","slug":"u-joint-failure-modes","status":"publish","type":"post","link":"https:\/\/gmb.net\/blog\/u-joint-failure-modes\/","title":{"rendered":"U-Joint Failure Modes &amp; Troubleshooting"},"content":{"rendered":"<p>The universal joint (U-joint) is a common part found on any rear-wheel drive or four-wheel drive vehicle, especially body-on-frame designs such as trucks and SUVs. The U-joint&#8217;s purpose is to transfer power to the driveshaft when the transmission and axle are at differing planes (heights). U-joints are always in pairs, usually at either end of the driveshaft.<\/p>\n<p><!--more--><\/p>\n<p>Common problems with universal joints are usually caused from a misalignment or imbalance in the drivetrain. However, some U-joints just fail because of age and corrosion. Knowing what to look and listen for should prevent your vehicle&#8217;s U-joints from completely failing.<\/p>\n<h2>The Signs and Symptoms of U-Joint Failure<\/h2>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1535\" src=\"https:\/\/gmb.net\/wp-content\/uploads\/2021\/07\/mechanics-2.jpg\" alt=\"Mechanics\" width=\"640\" height=\"424\" \/><\/h3>\n<h3>Unusual Sounds<\/h3>\n<p>The most commonly noticed U-joint failure symptom is a &#8220;clunk and ring&#8221; heard when the vehicle is shifted from drive to reverse or reverse to drive. This clunking followed by the ringing is the u-joint &#8216;locking&#8221; momentarily and then popping loose, causing the driveshaft to resonate slightly. This is caused by the joint&#8217;s bearings having worn thin from improper lubrication. Lubricating the u-joint at this point will not repair the problem, but it may extend the service life until a replacement is installed.<\/p>\n<p>A squeaking sound from dry universal joints can be heard at low speeds (under 10 mph). This is an indication that lubrication is sorely needed as metal-on-metal contact has begun. Lubrication or replacement should be undertaken immediately. Because U-joints flex with every turn of the driveshaft, this squeaking will quickly devolve into grinding and failure.<\/p>\n<h3>Vibration<\/h3>\n<p>Another common sign of U-joint problems is a vibration at middling speeds (25 mph). This is caused by the U-joint having failed enough that the driveshaft is moving side-to-side slightly with each rotation. It will be a higher-frequency vibration than a wheel imbalance produces, and it will often be accompanied by a slight &#8220;shimmy&#8221; (side-to-side movement) while driving.<\/p>\n<p>A vibrating driveshaft may accompany the &#8220;clunk and ring&#8221; mentioned above. The vibration indicates imminent failure of the U-joints, so immediate replacement is recommended.<\/p>\n<h3>Fluid Leaks<\/h3>\n<p>Finally, transmission fluid leaks from the U-joint couplings can indicate the joint has been separated from the transmission or differential. A problem other than the U-joint may be to blame, but the U-joint problem must be fixed immediately.<\/p>\n<h2>Best Practices For Identifying U-Joint Problems<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1536 size-medium\" src=\"https:\/\/gmb.net\/wp-content\/uploads\/2021\/07\/uni-joint.png\" alt=\"Uni Joint\" width=\"300\" height=\"278\" \/><\/p>\n<p>Troubleshooting and diagnosing U-joint problems and failures can be difficult. Many other drive system components can be related to the symptoms felt, including bad tires, steering misalignment, transmission problems, etc.<\/p>\n<p>Putting the vehicle on a dynamo and observing the undercarriage as the wheels spin can indicate the source of the problem. U-joint failures are often the result of another component&#8217;s problem rather than being a primary issue. If there is a U-joint failure, it&#8217;s important to look at the motor, axles, and other parts that may be contributing to the problem.<\/p>\n<p>A good mechanic can get a &#8220;feel&#8221; for U-joint or driveshaft problems. Here are a couple of inspection options to identify U-joint failure:<\/p>\n<ol>\n<li>With the vehicle on a lift and the transmission in neutral, the driveshaft should be free to spin. Turning it by hand can reveal loose play in the U-joints, a sure indication of trouble.<\/li>\n<li>Removing the driveshaft and its U-joints for inspection can also reveal problems. Be sure to mark it in relationship to the differential yoke so as to re-install it at its balance point.<\/li>\n<\/ol>\n<h2>Takeaways<\/h2>\n<p><iframe loading=\"lazy\" title=\"Signs That Your U-Joints Need Replacement\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/iUInIiCay78?feature=oembed&#038;modestbranding=1&#038;rel=0\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Universal joints are critical to your vehicle&#8217;s driveshaft and any U-joint problems should be addressed quickly. Most vehicles have a recommended interchange or lubrication interval for their u-joints. These should be followed closely to help avoid problems. If you do experience any of the signs and symptoms listed above, check out your U-joints. Finally, if your vehicle&#8217;s U-joints are failing, be sure to inspect other related components to avoid additional car problems.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The universal joint (U-joint) is a common part found on any rear-wheel drive or four-wheel drive vehicle, especially body-on-frame designs such as trucks and SUVs. The U-joint&#8217;s purpose is to transfer power to the driveshaft when the transmission and axle are at differing planes (heights). U-joints are always in pairs, usually at either end of&hellip;<\/p>\n","protected":false},"author":2,"featured_media":5029,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":"","editor_notices":[],"footnotes":""},"categories":[60],"tags":[34,55,47,90045],"class_list":["post-5028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-undercar","tag-maintenance","tag-preventative-maintenance","tag-u-joints","tag-universal-joint"],"acf":[],"_links":{"self":[{"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/posts\/5028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/comments?post=5028"}],"version-history":[{"count":1,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/posts\/5028\/revisions"}],"predecessor-version":[{"id":43650,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/posts\/5028\/revisions\/43650"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/media\/5029"}],"wp:attachment":[{"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/media?parent=5028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/categories?post=5028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gmb.net\/wp-json\/wp\/v2\/tags?post=5028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}