As a car owner, you know the importance of routine maintenance to keep your vehicle running smoothly. However, major repairs like transmission work can’t always be anticipated. When you’re faced with replacing your transmission, you probably have questions about what’s involved and how long does it take to install a transmission.
In this article, you will learn the complete process of transmission installation. From the removal of the old transmission to the installation of the new transmission, you’ll gain an understanding of each step involved and the time required. With this knowledge, you will feel empowered to make informed decisions about repairing or replacing your transmission. Whether you want to do the work yourself or get it done professionally.
Preparing for Transmission Installation
Before beginning the installation of your vehicle’s transmission, several preparations must be made to ensure an efficient process. As the transmission is a complex component, you will need to set aside enough time to complete the installation.
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Gather Necessary Tools and Parts
To install a transmission, you will need a range of special tools, equipment, and replacement parts. This includes new mounts, gaskets, seals, fluids, and fasteners. You’ll also need tools like wrenches, sockets, jacks, and a transmission lift. Obtaining all parts and tools in advance will reduce installation time.
Drain Transmission Fluid
The existing transmission fluid must be drained before removing the transmission. Place a pan under the transmission to catch the drained fluid. Then, locate the transmission drain plug – usually on the bottom of the transmission – and remove it to drain the fluid. Replace the drain plug once finished to prevent leakage. Dispose of used transmission fluid properly according to local regulations.
Disconnect Necessary Components
Several components surrounding the transmission must be disconnected before removing the transmission, including the driveshaft, axle, shift linkage, and wiring harness. You may need to reduce fuel system pressure and disconnect the exhaust, depending on the make and model of your vehicle. Label the connections as you work to ensure proper reconnection.
Support Vehicle and Transmission
With components disconnected, the transmission can be removed. However, the weight of the vehicle and transmission must be properly supported. Raise and support the vehicle with jack stands for bottom access. Use a transmission jack or lift to support the weight of the transmission during removal and installation.
By preparing thoroughly, gathering all necessary parts and tools, draining fluids, disconnecting surrounding components, and supporting the vehicle and transmission properly, you will ensure an efficient installation process for your new transmission. Take your time and work carefully when performing this complex repair.
Step-by-Step Process of Removing the Old Transmission
Drain the Transmission Fluid
The first step is to drain the used transmission fluid from your vehicle’s transmission pan. Place a drain pan under the transmission to collect drained fluid. Then, loosen the bolts holding the transmission pan using a socket wrench and remove the pan. Let the liquid drain completely.
Remove the Drive Shaft
Next, you need to remove the drive shaft that connects the transmission to the rear axle. Unbolt the drive shaft from the rear axle using a socket wrench. Then, unscrew the other end of the drive shaft from the transmission output shaft. Remove the drive shaft from the vehicle.
Disconnect Selector Linkage and Cooler Lines
Locate the selector linkage and cooler lines that are connected to your transmission. The selector linkage connects the gear shift selector to the transmission, while cooler lines circulate transmission fluid. Disconnect the selector linkage using a wrench or pliers. Then, disconnect the cooler lines using a line wrench, draining the fluid into a pan.
Support and Remove the Transmission
Now you are ready to remove the actual transmission. Place a transmission jack underneath the transmission to support its weight. Unbolt the transmission from the engine and cross member using a socket wrench. Carefully lower the transmission jack to remove the transmission from the vehicle.
Installing the New Transmission
Now that you have removed the faulty transmission, it is time to install the replacement unit. Carefully lift the new transmission and align it with the transmission mount. Lower it into place slowly, make sure the input shaft slides smoothly into the clutch assembly. Secure the transmission to the mount using the bolts you removed earlier.
Connecting the Driveshaft
With the transmission securely installed, you can now connect the driveshaft. Aligning the splines, slide the driveshaft toward the rear of the transmission. Push the driveshaft into place and tighten the bolt to secure it. Ensure the driveshaft has about 1/2 inch of play to allow for movement. If the driveshaft is too tight or loose, it can cause vibration, so take the time to adjust it properly.
Linking the Shift Linkage
Locate the shift linkage rod, and connect it to the manual shift lever on the new transmission at the specified pivot points. Adjust the linkage rod so that the transmission shifts smoothly and accurately into each gear. Lock the linkage rod in place with cotter pins once adjusted.
Adding Fluids and Finishing Up
With the mechanical connections complete, you can now add new transmission fluid and check for any leaks. Start the vehicle and shift gears to circulate the fluid. Recheck the fluid level with the dipstick and add fluid as necessary. Take the vehicle for a short test drive to make sure the new transmission is working properly before normal operation. Monitor it closely during the first few days of driving to identify any issues early. With the installation of a new, fully functioning transmission, your vehicle should provide many miles of dependable service.
Finishing Touches: Filling Fluids and Reconnecting Components
Once the new transmission has been properly installed and secured, there are several final steps required to complete the process and ensure safe operation of the vehicle.
Refilling Transmission Fluid
Transmission fluid is required for the proper functioning of the transmission. After installation, the fluid level in the new transmission will be low and will need to be refilled to the proper level according to the vehicle manufacturer’s specifications. To refill the fluid, locate the transmission dipstick, usually near the transmission. Pull out the dipstick, wipe it clean, re-insert it, and then pull it out again to check the fluid level. Add fluid through the dipstick tube until it reaches the “FULL” line on the dipstick.
Reconnecting Components
With the new transmission, the remaining components such as the shift linkage, wiring harness, and cooler lines must be reconnected. Shift linkages connect the gear shifter to the transmission and need to be reassembled and adjusted properly. Electrical connectors and wiring must also be plugged in to provide power and enable electronic components. Finally, transmission cooler lines carry hot transmission fluid to the radiator to cool it; These lines must be reconnected to prevent overheating.
Road Testing
A road test should always be performed after any major transmission work to ensure proper operation. Take the vehicle to local roads to test each gear, and check for any warning lights, strange noises, or leaks. Drive normally and avoid aggressive acceleration or heavy loads during the initial road test. If everything is working properly, the installation is complete.
With the final touches applied and successful road testing, the transmission installation process is completely completed. By following each step carefully and double-checking your work, you can feel confident in a job well done and enjoy many miles of service from the newly installed transmission.
How Long Does it take to Install a Transmission?
After diagnosing that you need a new transmission installed in your vehicle, the next question is how long the installation process will take. The total time will depend on a few factors, including the type of transmission, any additional repairs needed, and the experience of your mechanic.
Removal and Installation of the New Transmission
Most of the time during a transmission install is spent removing your old, faulty transmission and installing the replacement transmission. Depending on the make, model, and transmission type of your vehicle, it usually takes 6 to 12 hours for a skilled mechanic to complete this. Front-wheel drive vehicles generally take less time than rear-wheel or four-wheel drive models.
Additional Repairs or Services
In some cases, other components such as the flex plate, torque converter, or shifter linkage may also require replacement during transmission install. Making additional repairs will increase the total time. It’s also a good opportunity to service other parts of your drivetrain such as differential fluid, transfer case oil or a coolant flush. Discuss any recommended additional services with your mechanic to determine if you want to have them completed at the same time.
Test Drive and Final Checks
Once the new transmission is installed and any other repairs are made, your mechanic will take your vehicle for a test drive to ensure its functioning properly before releasing it back to you. They will check that the transmission is shifting smoothly, there are no leaks or strange noises, and all electrical components like the speedometer or tachometer are working correctly. Final checks and the test drive typically add 1 to 2 hours to the total time.
Overall, you can expect a full transmission replacement and installation for a standard vehicle to take between 8 to 16 hours at a shop with experienced technicians. While it’s not a quick process, replacing your transmission will get your vehicle back on the road and provide you with many more years of reliable service. With the time and money invested, it’s well worth having the job done right by a trusted local mechanic.