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Transmission Assembly Guides

How to Shop for the Perfect Transmission Assembly for Your Car

The transmission assembly is a part of the engine that allows you to drive at different speeds. So if you find that your car isn't responding to you shifting gears, then your transmission assembly might be at risk. Don't let a faulty transmission ruin your driving capability. Find the perfect assembly to keep your car running at it optimum performance.


  • Do your research before buying your transmission assembly. Aside from knowing how your transmission works, it is also important that you know the exact specifications of your entire assembly. This will help you find a compatible match for your engine, from its drive ratios down to its bolt patterns.
  • Know what other parts are needed to replace your transmission assembly. Plan ahead and purchase bolts or adapters that are needed to connect it to the rest of your system. Also make sure that it is made of high-grade material and will last as long as the transmission assembly itself.
  • Inspect the transmission assembly you want to purchase. Make sure to turn your transmission upside down to check for possible rusting or leaks. You can start with checking the condition of the input shaft and internal rotating gears. Make sure that all gears are working perfectly and that they are free of any wear or damage. If you're not a mechanical whiz and you don't know which part should go where, it's best to bring someone who is familiar with the possible problems of a transmission assembly.


  • Don't make a payment without going through the details of the product. Whether you're purchasing one from a dealer or a salvage yard, make sure that you choose high-quality transmission assemblies. For used assemblies, you can go through the part's history to look for possible loop holes. When buying new ones, it's usually enough to buy an assembly from a brand you trust.
  • Don't buy an assembly without undergoing high-tech transmission diagnostics. This precautionary measure ensures that the insides of your transmission assembly are working perfectly fine.
  • Don't purchase a transmission assembly without a warranty. If possible, negotiate your warranty to give you the best possible value for your money. Be a smart shopper! Remember to ask question regarding the terms of the warranty and its limitations.

How to Replace Your Damaged Automatic Transmission Assembly

Your car's automatic transmission assembly is responsible for transmitting the power from the engine to the wheels. Considering its important role, it's a good thing that this system doesn't just break down without any warning. If you've been having problems accelerating your car or putting it on the second gear, then it's highly likely that its automatic transmission assembly has now reached the end of its service life. To ensure that you won't be having any more transmission-related problems anytime soon, it's highly recommended to have it replaced. You can save money by simply doing this as a DIY task. Check out these steps:

Difficulty level: Difficult

Things that you will need:

  • Wrenches
  • Ratchet and socket set
  • Transmission jack
  • Floor jacks
  • Jack stands
  • Screwdrivers
  • Pliers
  • Drain pan
  • Penetrating lubricant
  • Replacement automatic transmission assembly
  • Wood block

Step 1: Raise the front and back portion of your vehicle using the floor jacks and support it with the jack stands. Make sure that you parked your car on a level-surfaced area to prevent it from falling on you while you do the rest of the procedures.

Step 2: Disconnect the negative battery cable from its terminal to avoid electrocution when you fiddle with the electrical bits of your vehicle. To fully avoid battery arching, you should wrap a rag around the cable's end and move it away from the terminal.

Step 3: Locate the driveshaft on the rear part of your vehicle and detach it from the transmission. To do this, you must first remove the U-bolts and nuts that are holding it in place. Use a wrench for this step, and make sure that you place all of the mounting hardware on a labeled and organized container to avoid confusion when reinstalling them later.

Step 4: Disconnect the coolant lines from the radiator and bleed its content onto the drain pan. Make sure that your car has completely cooled down before doing this step to avoid accidents.

Step 5: Using a wrench, remove the nuts that are used to secure the speedometer cable and shift linkage onto the transmission assembly.

Step 6: After you got the speedometer cable and shift linkage out of the way, you should now remove the transmission-to-flywheel bolts next. If needed, gradually move the crankshaft pulley to gain better access to these bolts.

Step 7: Disconnect the transmission bell housing from the cylinder block.

Step 8: Take the wood block and place it on the jack. Gradually raise the jack until the wood block is supporting the automatic transmission assembly.

Step 9: Remove all the mounting hardware that are used to hold the automatic transmission assembly to the motor. Once you've taken off all the fasteners, carefully loosen the transmission until you can slide it off the vehicle.

Step 10: Pull the torque converter out of the old automatic transmission assembly and drain its content. Refill it again with fresh transmission fluid and connect the torque converter to the new automatic transmission assembly.

Step 11: Connect the torque converter to the new automatic transmission assembly.

Step 12: Mount the new automatic transmission assembly on the vehicle. Make sure that all the fasteners and mounting hardware are located on their proper places. Torque them up according to the manufacturer's specifications to avoid problems.

This tricky replacement procedure may take around four hours to finish. To make this task easier for you to carry out, ask a friend for help.

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