{"id":89473,"date":"2023-09-08T06:00:07","date_gmt":"2023-09-08T13:00:07","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=89473"},"modified":"2025-03-15T06:07:29","modified_gmt":"2025-03-15T13:07:29","slug":"what-causes-a-transmission-not-to-shift","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-causes-a-transmission-not-to-shift\/","title":{"rendered":"What Causes a Transmission Not To Shift?"},"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-column89473_2144c5-5c > .kt-inside-inner-col,.kadence-column89473_2144c5-5c > .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-column89473_2144c5-5c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column89473_2144c5-5c > .kt-inside-inner-col{flex-direction:column;}.kadence-column89473_2144c5-5c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column89473_2144c5-5c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column89473_2144c5-5c{position:relative;}@media all and (max-width: 1024px){.kadence-column89473_2144c5-5c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column89473_2144c5-5c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column89473_2144c5-5c inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3d57fc  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-622e1b\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading89473_c76cc6-de, .wp-block-kadence-advancedheading.kt-adv-heading89473_c76cc6-de[data-kb-block=\"kb-adv-heading89473_c76cc6-de\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading89473_c76cc6-de mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading89473_c76cc6-de[data-kb-block=\"kb-adv-heading89473_c76cc6-de\"] 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-heading89473_c76cc6-de img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading89473_c76cc6-de[data-kb-block=\"kb-adv-heading89473_c76cc6-de\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading89473_c76cc6-de summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading89473_c76cc6-de\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Low or dirty transmission fluid, a malfunctioning PCM, and other electrical issues can prevent the transmission from shifting properly.<\/strong><\/li>\n\n\n\n<li>In the case of a manual transmission, a worn-out clutch and broken transmission linkage can affect its operation.<\/li>\n\n\n\n<li>Grinding noises when switching gears are indicative of broken synchronizers. Failure to address this issue can lead to a rough shifting transmission.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Can you imagine driving your car without shifting your gear at least once? You probably won&rsquo;t even be able to move your car out of the driveway if your transmission won&rsquo;t shift from park or neutral.<\/p>\n\n\n\n<p>Whether you drive an automatic or a manual vehicle, it&rsquo;s important to always make sure your transmission is in top shape. If it isn&rsquo;t, you&rsquo;ll need to figure out what&rsquo;s preventing your transmission from shifting as soon as possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Your Automatic Transmission Won&rsquo;t Shift<\/h2>\n\n\n\n<p>Unfortunately, answering the question &ldquo;Why is my automatic car not shifting gears?&rdquo; isn&rsquo;t going to be easy. A lot of things can go <a href=\"https:\/\/www.carparts.com\/blog\/bad-automatic-transmission-symptoms-repair-cost-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wrong with your automatic transmission\">wrong with your automatic transmission<\/a>, so figuring out why is going to take a while, but you can start with some of these common causes:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Low or Dirty Transmission Fluid<\/h3>\n\n\n\n<p>Is your transmission slipping while your engine is revving high? If it is, then you might be dealing with <a href=\"https:\/\/www.carparts.com\/blog\/how-to-check-automatic-transmission-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"low or dirty automatic transmission fluid\">low or dirty automatic transmission fluid<\/a> (ATF). ATF helps power and protect your transmission, so if it leaks from a <a href=\"https:\/\/www.carparts.com\/blog\/bad-oil-cooler-line-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"damaged cooler line\">damaged cooler line<\/a> or gets dirty, then your car probably won&rsquo;t shift.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Malfunctioning PCM<\/h3>\n\n\n\n<p>A lot can go wrong if your vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/car-pcm-meaning-symptoms-of-failure-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"powertrain control module (PCM)\">powertrain control module (PCM)<\/a> suddenly stops working, and your automatic transmission is one of them. Your PCM constantly uses information like your engine&rsquo;s speed and throttle position to operate your automatic transmission, so if it glitches or malfunctions, then your transmission probably won&rsquo;t go into gear.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other Electrical Issues<\/h3>\n\n\n\n<p>If your PCM is working perfectly, then you might be dealing with other electrical issues. Your automatic transmission relies on different sensors, switches, and electrical wiring to function, so if a <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wire short-circuits\">wire short-circuits<\/a> or a sensor gets clogged, then your transmission might stop working too.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Shift Lock<\/h3>\n\n\n\n<p>Today, most automatic vehicles come with a shift lock safety mechanism that prevents the transmission from shifting out of park unless the driver is properly seated with their foot on the brake. It&rsquo;s a great safety feature that prevents kids or pets from accidentally shifting the gear, but it isn&rsquo;t perfect.<\/p>\n\n\n\n<p>In some cases, it can malfunction and prevent you from shifting into gear and driving your vehicle. Thankfully, overriding this safety feature usually just requires inserting your key into a slot somewhere on your center console.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bad Torque Converter<\/h3>\n\n\n\n<p>As its name suggests, the torque converter converts torque from the engine into hydraulic pressure that your transmission uses to shift gears. If the <a href=\"https:\/\/www.carparts.com\/blog\/bad-torque-converter-symptoms-diagnosis-repair-faqs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"torque converter fails\">torque converter fails<\/a>, your transmission can slip out of gear. You might also notice your vehicle vibrating even when you aren&rsquo;t driving fast.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Broken Transmission Linkage<\/h3>\n\n\n\n<p>If your car won&rsquo;t shift gears, then there&rsquo;s a chance that you might be dealing with a broken linkage. Sometimes, accidents or bumpy roads can cause the linkage between the shifter in the cabin and the transmission to disconnect.<\/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\">Broken Shift Cable<\/h3>\n\n\n\n<p>Automatic transmissions have shift cables that connect the gear shifter to the transmission. The cable transmits shifter movement to the transmission, which allows you to select the gear.<\/p>\n\n\n\n<p>A broken or stretched cable may cause gear shift failure, leaving the vehicle stuck in park or neutral.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Worn-out Transmission Bands<\/h3>\n\n\n\n<p>Automatic transmission brake bands are flexible steel plates lined with friction material that help control the movement of transmission components. As these bands lose their friction material and wear down, a gap forms between them and the drum. When this happens, the transmission may start to slip.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Your Manual Transmission Won&rsquo;t Shift<\/h2>\n\n\n\n<p>A bad transmission is bad news, especially if you often drive on highways and busy roads. For your own safety, it&rsquo;s best to diagnose a faulty manual transmission as soon as possible. Here are some common causes to consider:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Worn-Out Clutch<\/h3>\n\n\n\n<p>If your manual transmission won&rsquo;t shift, then the culprit might be a <a href=\"https:\/\/www.carparts.com\/blog\/clutch-replacement-bad-clutch-symptoms-costs-and-faqs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"worn-out clutch\">worn-out clutch<\/a>. Issues with the clutch pedal linkage can cause your clutch to drag and put extra strain on your transmission.<\/p>\n\n\n\n<p>In some cases, you might be dealing with a bad clutch disc, which can wear out on some manual vehicles. It can cause your transmission to slip and lose power, so you&rsquo;ll want to replace a faulty clutch disc as soon as possible.<\/p>\n\n\n\n<p>If it is the clutch, one thing you can try is to put your shifter in gear before starting the vehicle. It should automatically start driving forward or backward, depending on what gear you put it in. If you are doing this, be careful because pushing in the clutch will not stop the vehicle. You&rsquo;ll also need to turn off the key.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dirty Transmission Fluid<\/h3>\n\n\n\n<p>When was the last time you changed your <a href=\"https:\/\/www.carparts.com\/blog\/what-is-transmission-fluid-and-other-faqs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"transmission fluid\">transmission fluid<\/a>? Manual transmissions need manual transmission fluid (MTF) to function properly. Unfortunately, MTF can also break down over time from a buildup of dirt, debris, and other particles.<\/p>\n\n\n\n<p>Dirty MTF won&rsquo;t just stop your transmission from shifting into gear. It&rsquo;ll end up wreaking havoc on your transmission too. Luckily, <a href=\"https:\/\/www.carparts.com\/blog\/how-to-change-transmission-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"replacing MTF\">replacing MTF<\/a> isn&rsquo;t complicated or pricey, so you can do it as soon as possible.<\/p>\n\n\n\n<p>Generally servicing the manual transmission fluid is done by removing the drain plug and the fill plug. The fluid will drain pretty fast, especially once the fill plug is pulled. After, pump the fluid into the fill hole until it runs out of the hole. Then you can put the drain plug back in.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Broken Transmission Linkage<\/h3>\n\n\n\n<p>Just like an automatic transmission, your manual transmission can fail if the transmission linkage breaks. It isn&rsquo;t one of the more common culprits of a manual transmission not shifting, but it can still happen if you drive over rough roads often.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Faulty Clutch Master Cylinder<\/h3>\n\n\n\n<p>Manual vehicles typically come with a clutch master cylinder, which is responsible for converting the mechanical movement of the clutch pedal to hydraulic pressure. In other words, it helps send hydraulic fluid back to the slave cylinder, so you can disengage the clutch from your transmission.<\/p>\n\n\n\n<p>If the <a href=\"https:\/\/www.carparts.com\/blog\/bad-clutch-master-cylinder-symptoms-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"clutch master cylinder fails\">clutch master cylinder fails<\/a>, this is bad news for your transmission. The clutch pedal will start to feel easy to press, and you&rsquo;ll soon find it hard to shift gears.<\/p>\n\n\n\n<p>Here&rsquo;s a tip: the clutch master is generally on the firewall near the brake booster. Meanwhile, the slave cylinder can be external on the transmission or inside the bell housing, which requires removing the transmission to service it.<\/p>\n\n\n<style>.kadence-column89473_2f59f9-cf > .kt-inside-inner-col,.kadence-column89473_2f59f9-cf > .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-column89473_2f59f9-cf > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column89473_2f59f9-cf > .kt-inside-inner-col{flex-direction:column;}.kadence-column89473_2f59f9-cf > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column89473_2f59f9-cf > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column89473_2f59f9-cf{position:relative;}@media all and (max-width: 1024px){.kadence-column89473_2f59f9-cf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column89473_2f59f9-cf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column89473_2f59f9-cf kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id89473_f41932-b7 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id89473_f41932-b7 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id89473_f41932-b7 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id89473_f41932-b7 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id89473_f41932-b7 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id89473_f41932-b7 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id89473_f41932-b7 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id89473_f41932-b7 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column89473_7ed729-35 > .kt-inside-inner-col{display:flex;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col{min-height:45px;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col,.kadence-column89473_7ed729-35 > .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-column89473_7ed729-35 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col > *, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column89473_7ed729-35{position:relative;}@media all and (max-width: 1024px){.kadence-column89473_7ed729-35 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column89473_7ed729-35 > .kt-inside-inner-col > *, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column89473_7ed729-35 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col > *, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column89473_7ed729-35 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column89473_7ed729-35 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column89473_7ed729-35 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image89473_c05242-8d.kb-image-is-ratio-size, .kb-image89473_c05242-8d .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image89473_c05242-8d.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image89473_c05242-8d .kb-image-is-ratio-size{align-self:unset;}.kb-image89473_c05242-8d figure{max-width:45px;}.kb-image89473_c05242-8d .image-is-svg, .kb-image89473_c05242-8d .image-is-svg img{width:100%;}.kb-image89473_c05242-8d .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image89473_c05242-8d\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column89473_64c2b2-bb > .kt-inside-inner-col,.kadence-column89473_64c2b2-bb > .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-column89473_64c2b2-bb > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column89473_64c2b2-bb > .kt-inside-inner-col{flex-direction:column;}.kadence-column89473_64c2b2-bb > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column89473_64c2b2-bb > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column89473_64c2b2-bb{position:relative;}@media all and (max-width: 1024px){.kadence-column89473_64c2b2-bb > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column89473_64c2b2-bb > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column89473_64c2b2-bb inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            The clutch master is generally on the firewall near the brake booster. Meanwhile, the slave cylinder can be external on the transmission or inside the bell housing, which requires removing the transmission to service it.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Bad Synchronizers<\/h3>\n\n\n\n<p>If your car starts making unusual grinding noises whenever you try to switch gears, then you might want to check your synchronizers. Synchronizers help your transmission shift gears smoothly, but they can wear over time from aggressive shifting and heavy-footed driving.<\/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>Can you imagine driving your car without shifting your gear at least once? You probably won&rsquo;t even be able to&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/what-causes-a-transmission-not-to-shift\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":91104,"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":[],"ppma_author":[2607,3742],"class_list":{"0":"post-89473","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-transmission","9":"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>What Causes a Transmission Not To Shift? - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Dealing with a transmission that won\u2019t change gears? 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