How to Replace an Automatic Transmission

Below guide will teach you How to Replace an Automatic Transmission . Please follow the instructions carefully.

Things You’ll Need:

  • Floor Jack
  • 3/8 in. Drive Ratchet
  • Jack Stand Set
  • Transmission Jack
  • Socket and Ratchet Set
  • Socket Extension Set
  • Drain Pan
  • Combination Wrench Set
  • Screwdriver
  • Pliers
  • 1/2 in. Drive Ratchet
  • Automatic Transmission Fluid
  • Transmission Assembly

Estimated Costs:

  • DIY Costs: Est. $2,903.86 parts only
  • Shop Costs: Est. $3,940.39 parts and labor


  • Take a small drive and observe the functioning of the automatic transmission.
  • Make sure that the transmission shifts through all the gears. This will give you better idea about your automatic transmission functionality and defects.
  • Park the vehicle on a level surface and set the parking brake.
  • Detach the negative battery cable from the terminal.
  • Detach the transmission throttle connection from the carburetor or throttle body.
  • Take the oil filler tube away.
  • Lift the front of the vehicle with floor jack. Chock the rear wheels.
  • Remove all the electrical connectors from the starter, backup switches, sensors and solenoid.
  • Also detach the starter wiring from the starter.
  • Take the starter away by unfastening the bolts.
  • Place a drain pan under the transmission pan and drain out all the transmission fluid by unfastening the transmission pan bolts.
  • You may have to disconnect the exhaust pipe from the exhaust manifold and other cross tubes to gain access to the transmission.
  • Detach shift linkage and the speedometer cable from the transmission.
  • If your vehicle is a rear wheel drive, it is better to mark the rear driveshaft flange and the pinion flange. This mark will help you to line up the flange later in the installation process.
  • Open the U-bolts and take the driveshaft out.
  • You may need to remove the transmission oil cooler lines from the transmission.
  • Support the transmission with a transmission jack and unfasten the transmission mount attached to the transmission crossmember.
  • To relieve the pressure on the mount, escalate the transmission using the transmission jack.
  • Take the crossmember away by unscrewing the bolts.
  • Gradually shift the transmission down till the point where you can support the transmission to the transmission jack with chain.
  • Take the engine flex plate cover off. This will help you access the transmission and engine bolts easily.
  • To reach torque converter bolts, take away shields or any other covers.
  • Unbolt the torque converter by turning the crankshaft.
  • Transmission is often secured to engine frame with bolts. Unbolt the transmission.
  • In order to take the transmission away from the engine, drag the transmission slightly backwards.
  • After removing the transmission, make use of bungee cord or wire to protect the torque converter to the transmission bell housing.
  • Drag the transmission backwards and move it low once at the same time.
  • Take the torque converter out as you remove the transmission.
  • Place drain pan underneath the transmission and torque converter.
  • Drag the torque converter out of the transmission housing. Let the fluid drain out in the drain pan.
  • Add new transmission fluid to the torque converter.
  • Drive the torque converter to the inner of the transmission. You may need to spin the torque converter while spinning it inward.
  • To make certain that the torque converter is lined up correctly, measure the distance on both the sides of the torque converter from the transmission. The distance should be the same on both sides.
  • Lift the transmission slightly and adjust it properly so that it becomes in line with the engine.
  • Using guide pins, align the transmission with engine while driving the transmission into the engine.
  • Secure the torque converter with bolts.
  • Secure the transmission to the engine by means of bolts. Torque the bolts properly.
  • Raise the transmission and reinstall the crossmember. Secure the crossmember.
  • Now you have to put back the transmission mount.
  • Shift the transmission down gradually till the transmission rests on the mount. Secure the mounts with bolts.
  • Now, reinstall the oil filler tube.
  • Take a new exhaust gasket and reattach the exhaust tube back to the exhaust manifold using the new gasket.
  • If there are transmission cooler lines, reconnect them to the transmission.
  • Put the engine cover back. Also reattach the throttle linkage as well as shift linkage.
  • Reconnect all the electrical connectors back to the transmission.
  • Reattach the speedometer cable as well as driveshaft.
  • Take a manufacturer recommended transmission fluid and add this fluid to the transmission oil pan.
  • Shift the vehicle down and turn the engine on. Shift the transmission to all the gears while still in halt position.
  • Examine the fluid level again with the help of dipstick and add more fluid if required.
  • Examine the transmission and its surrounding area for any signs of leak.
  • Take a vehicle on a test drive to ensure that the replaced automatic transmission system is operating fine.

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