If they are, repair or replace them as necessary. Finally, check the transmission cooler lines to make sure they’re not plugged or leaking. Next, check the transmission filter to make sure it’s clean. If it’s low or dirty, top it off or change it. First, check the transmission fluid level and condition. If your Allison Transmission isn’t working properly, there are a few things you can do to troubleshoot the problem. Allison Transmission Troubleshooting Guide If you’re experiencing either of these problems (or any other issues) with your Allison transmission, it’s best to take it to a qualified technician for diagnosis and repair rather than trying to fix it yourself – especially if you don’t have experience working on transmissions. Worn clutch packs can also cause hard shifting if this is the case, they’ll need to be replaced as well. You may also need to have your shift forks or synchronizers repaired or replaced if they’re damaged. This can be caused by a variety of things, including incorrect shifter adjustment, damaged shift forks or synchronizers, or worn clutch packs.Īgain, checking and adjusting the fluid level is always a good place to start troubleshooting this type of issue. You may also need to replace your clutch packs if they’re worn out.Īnother common Allison transmission problem is hard shifting. If the fluid looks dirty or contaminated, it needs to be replaced. If it’s low, add more and see if that solves the problem. If you think your transmission is slipping, check the fluid level first. This can be caused by a number of factors, including low fluid levels, contaminated fluid, or worn clutch packs. One common problem with Allison transmissions is slipping. If you’re having issues with your Allison transmission, here are a few potential causes to check out. Allison 6 Speed Transmission ProblemsĪllison transmissions are some of the most popular and reliable on the market, but like any complex piece of machinery, they can sometimes have problems. If you’re dealing with Allison transmission problems on your Silverado 2500HD, then you’re certainly not alone.īut hopefully Chevrolet will finally take some responsibility and start offering better support for their customers who are being affected by these serious defects. That’s why many owners have had to resort to filing lawsuits or taking matters into their own hands by making aftermarket repairs themselves. This has led to more frequent failures and a shorter lifespan for the transmissions.įinally, it’s worth noting that Chevrolet has been slow to address these issues publicly or offer much in terms of customer support. Another issue is that GM has been using lower quality materials in their transmissions in recent years in order to save costs. So what exactly is causing all these transmission problems? There are actually a few different factors at play.įirst, the Allison 1000 series transmissions were not designed to handle the heavy-duty loads that the Silverado 2500HD is capable of hauling.Īs a result, they often overheat and suffer premature wear and tear. In fact, there’s even a class action lawsuit against GM for these defects. If you’re the owner of a Chevy Silverado 2500HD, then you might be all too familiar with Allison transmission problems.įor years, these trucks have been plagued with issues ranging from hard shifting to complete failure. The 2500 has been plagued with problems since its inception, with many owners reporting issues with shifting, torque converter failure, and poor fuel economy. It was introduced in 1998 as an alternative to the 5-speed Allison 1000 transmission. The Allison 2500 transmission is a 6-speed automatic transmission used in light and medium duty trucks.
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