{"id":69608,"date":"2022-07-13T03:03:28","date_gmt":"2022-07-13T10:03:28","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=69608"},"modified":"2024-01-19T03:32:47","modified_gmt":"2024-01-19T11:32:47","slug":"transmission-seal-leak-symptoms-plus-causes-of-failure","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/transmission-seal-leak-symptoms-plus-causes-of-failure\/","title":{"rendered":"Transmission Seal Leak Symptoms, Plus Causes of Failure"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_2d5dc5-96 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_2d5dc5-96 > .kt-inside-inner-col,.kadence-column_2d5dc5-96 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_2d5dc5-96 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_2d5dc5-96 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_2d5dc5-96 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_2d5dc5-96 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_2d5dc5-96{position:relative;}@media all and (max-width: 1024px){.kadence-column_2d5dc5-96 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_2d5dc5-96 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_2d5dc5-96 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-7bfb5b  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-7d35d5\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2, .wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2[data-kb-block=\"kb-adv-heading_91cf7b-d2\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2[data-kb-block=\"kb-adv-heading_91cf7b-d2\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_91cf7b-d2[data-kb-block=\"kb-adv-heading_91cf7b-d2\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_91cf7b-d2 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_91cf7b-d2\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Static and dynamic transmission seals deteriorate over time because most oil seals are typically made from synthetic rubber that hardens or softens after several years.<\/li><li>If a transmission seal breaks, leaking transmission fluid can cause serious transmission issues like gears grinding and slipping, excess vibration, slow acceleration, delayed gear shifts, and an overheating transmission.<\/li><li>A leaking transmission seal will show some symptoms like dark spots under your vehicle, brown-colored fluid on the transmission dipstick, and an illuminated transmission light.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Transmission seals play a crucial role in preventing <a href=\"https:\/\/www.carparts.com\/blog\/how-to-fix-a-transmission-leak\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid from leaking\">transmission fluid from leaking<\/a>. There are two types of transmission seals in a vehicle, depending on their purpose. Without a proper seal, your vehicle can leak <a href=\"https:\/\/www.carparts.com\/blog\/how-to-check-automatic-transmission-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid\">transmission fluid<\/a> and develop serious issues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is a Transmission Seal?<\/h2>\n\n\n\n<p>There are two types of transmission seals. There are static seals and dynamic seals. Static oil seals are used between two non-moving parts, while a dynamic oil seal is used between a fixed and a moving part. The <a href=\"https:\/\/www.carparts.com\/o-ring\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"o-ring\">o-ring<\/a> is one example of a static seal. O-rings are installed around parts like the oil filters and the front gearbox cover.<\/p>\n\n\n\n<p>There are also dynamic seals, which typically seal the gap between the transmission case and a rotating shaft. Dynamic seals are more complex, since they have to prevent fluid from leaking between a moving and non-moving component.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-1024x614.png\" alt=\"transmission seal\" class=\"wp-image-69751\" width=\"1024\" height=\"614\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-1024x614.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-300x180.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-768x461.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-150x90.png 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>There are two types of transmission seals: the static oil seals that are used between two non-moving parts, and a dynamic oil seal that is used between a fixed and a moving part.<\/figcaption><\/figure>\n\n\n\n<p>A vehicle typically has two or three dynamic oil seals. One example is the input shaft seal. It prevents fluid from passing through the gap between the input shaft and the transmission housing. The input shaft is the part that connects the transmission to either the torque converter or clutch disk, depending on the transmission type.<\/p>\n\n\n\n<p>Another dynamic oil seal located at the transmission&rsquo;s output shaft is called the rear transmission seal or <a href=\"https:\/\/www.carparts.com\/driveshaft-seal\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"driveshaft seal\">driveshaft seal<\/a>. The output shaft is the part that transfers power to the wheels. Front-wheel drive vehicles have two transmission seals because they have two output shafts, one for each axle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Do Transmission Seals Work?<\/h2>\n\n\n\n<p>Static seals are relatively simple. They seal fluid by using a thin strip of synthetic rubber that&rsquo;s wedged between the gap of two conjoined parts. Since rubber is elastic, it can stretch to fill the small gaps between two separate parts. Dynamic seals are a little more complex since the input and output shafts can rotate thousands of times a minute. How does a dynamic transmission seal keep fluid inside when the shaft is constantly moving?<\/p>\n\n\n\n<p>Dynamic seals have a more complicated shape, with one or two lips depending on their design. The outer lip fits into a recess on the transmission case, while the input or output shafts are inserted through the inner lip. A thin coiled spring, known as a garter spring, is fitted along the inner lip. As the input or output shaft spins, the garter spring exerts pressure onto the sealing lip. This constant pressure keeps the rubber sealing lip in contact with the revolving shaft, preventing transmission fluid from seeping through.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Do Transmission Seals Fail?<\/h2>\n\n\n\n<p>Both static and dynamic seals deteriorate over time because most oil seals are typically made from synthetic rubber. This material typically hardens or softens after several years of exposure to oxygen, heat, or light. When this happens, the seal can start to fail. Dynamic seals might also wear out faster because they&rsquo;re constantly in contact with a moving part.<\/p>\n\n\n\n<p>Another reason why dynamic seals fail is because of excessive play between the rotating assembly and the inside of the transmission. Front-wheel drive vehicle axle seals can leak if the inner side of the axle rests on the inside of the transmission. The output shaft seal of a transmission can also leak if there&rsquo;s excessive tailshaft play caused by excessive bearing play.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Happens If a Transmission Seal Breaks<\/h2>\n\n\n\n<p>The transmission seal doesn&rsquo;t directly contribute to the transmission&rsquo;s role of transferring power to the wheels and applying gear ratios. However, keeping the transmission seal working properly is very important because leaking transmission fluid can cause serious transmission issues.<\/p>\n\n\n\n<p>Leaks are often discovered while your vehicle is parked because fluid droplets can accumulate under your vehicle&rsquo;s gearbox. Automatic transmission fluid often appears crimson in color. Meanwhile, the fluid in manual transmissions is semi-transparent or honey-colored. Your vehicle will likely exhibit the following symptoms if it&rsquo;s leaking transmission fluid:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Grinding Gears<\/h3>\n\n\n\n<p>Since transmission fluid prevents metal on metal contact between components, a lack of fluid can result in grinding noises.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gear Slipping<\/h3>\n\n\n\n<p>When the engine&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/what-does-car-rpm-stand-for\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"RPM\">RPM<\/a> increases and the vehicle doesn&rsquo;t speed up normally, then it could be because the fluid level is low and gears are slipping.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Excess Vibrations<\/h3>\n\n\n\n<p>Grinding gears and gears slipping can also cause the transmission to create more vibrations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Slow Acceleration<\/h3>\n\n\n\n<p>Your vehicle&rsquo;s transmission will struggle to shift gears without enough transmission fluid. Expect gear shifts to be slower and clunkier. As a result, your ability to <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-accelerate-properly-when-i-push-the-gas-causes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"accelerate will be hampered\">accelerate will be hampered<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Delayed Gear Shifts<\/h3>\n\n\n\n<p>Reduced transmission fluid can result in slower gear shifts, which can lead to slower acceleration.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Overheating Transmission<\/h3>\n\n\n\n<p>The transmission can accumulate too much heat if there isn&rsquo;t enough fluid to cool it. This can lead to transmission <a href=\"https:\/\/www.carparts.com\/blog\/what-damage-to-expect-from-an-overheating-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"damage\">damage<\/a> or even transmission failure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Burning Smell<\/h3>\n\n\n\n<p>Overheating transmission fluid may produce a burning smell.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signs of a Leaking Transmission Seal<\/h2>\n\n\n\n<p>Your vehicle will give off signs if the transmission seal is leaking. Here are some symptoms for you to check:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fluid Leaks&nbsp;<\/h3>\n\n\n\n<p>You can check if the transmission seal is leaking by looking beneath your car. If you notice dark spots, then it&rsquo;s likely transmission fluid that leaked out.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Brown-Colored Dipstick<\/h3>\n\n\n\n<p>You can check the transmission fluid level by looking at the dipstick. A brown-colored one indicates the transmission fluid needs replacing. And if the level is low, there&rsquo;s a chance a leak drained most of the fluid.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Transmission Light<\/h3>\n\n\n\n<p>An illuminated transmission light could signal different issues. One of which is an overheating transmission caused by the transmission fluid.<\/p>\n\n\n\n<p>A transmission leak should be repaired as soon as possible. A leak can starve your transmission of the fluid it needs for cooling and lubrication. If a leak is allowed to persist, it can cause the transmission to run low on fluid. This can result in severe damage. At that point, the transmission will need to be rebuilt or replaced.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How To Get a Quality Replacement Transmission Seal<\/h2>\n\n\n\n<p>We know it isn&rsquo;t always easy to find the time to look for quality replacement parts for your vehicle, but a faulty transmission seal is a big red flag you can&rsquo;t just ignore. Thankfully, you can get a great part with a guaranteed fit here at CarParts.com.<\/p>\n\n\n\n<p>Nobody likes waiting too long for their packages, but that won&rsquo;t be an issue. If you order at CarParts.com, you can expect your new transmission seal to arrive in as little as two business days thanks to our strategically located warehouses.<\/p>\n\n\n\n<p>CarParts.com also has a wide range of products that feature durable and cutting-edge <a href=\"https:\/\/www.carparts.com\/transmission-seal\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission seal\">transmission seal<\/a> replacements for various vehicle makes and models. Just be sure to input your vehicle&rsquo;s details in our vehicle selector, so you can browse our catalog with ease.<\/p>\n\n\n\n<p>Our available parts are ready to ship too, so order now and enjoy high-quality products and fast shipping!<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Transmission seals play a crucial role in preventing transmission fluid from leaking. There are two types of transmission seals in&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/transmission-seal-leak-symptoms-plus-causes-of-failure\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":69750,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3748],"tags":[3401],"ppma_author":[2607,2855,3742],"class_list":{"0":"post-69608","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-transmission","9":"tag-transmission-seal","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Transmission Seal Leak Symptoms, Plus Causes of Failure - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Transmission seals play a crucial role in preventing transmission fluid leaks. Learn more about them in this handy guide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/transmission-seal-leak-symptoms-plus-causes-of-failure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transmission Seal Leak Symptoms, Plus Causes of Failure - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Transmission seals play a crucial role in preventing transmission fluid leaks. Learn more about them in this handy guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/transmission-seal-leak-symptoms-plus-causes-of-failure\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-13T10:03:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-19T11:32:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2022\/06\/transmission-seal-installation-1024x681.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"681\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/transmission-seal-leak-symptoms-plus-causes-of-failure\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/transmission-seal-leak-symptoms-plus-causes-of-failure\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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