How to Replace a Rear Main Seal

Below guide will teach you How to Replace a Rear Main Seal . Please follow the instructions carefully.

Things You’ll Need:

  • Floor Jack
  • 3/8 in. Drive Ratchet
  • Pry Bar
  • Slide Hammer
  • Jack Stand Set
  • Transmission Jack
  • Socket and Ratchet Set
  • Scraper
  • Bungee Cord
  • Awl
  • Combination Wrench Set
  • Screwdriver
  • 1/2 in. Drive Ratchet
  • Rear Main Seal
  • Shop Towel

Estimated Costs:

  • DIY Costs: Est. $33.64 parts only
  • Shop Costs: Est. $395.43 parts and labor


  • Park the vehicle on a flat surface and prop the engine hood up.
  • In the engine block, disconnect the negative battery cable from the battery terminal.
  • Detach the transmission throttle linkages and also the wiring harness like solenoids, sensors, starter and backup switches.
  • Take the starter away by removing the mounting bolts.
  • Take the transmission out. Before that, drain the transmission fluid.
  • Detach exhaust pipes and cross tubes. Exhaust pipes are usually connected to the exhaust manifold.
  • Remove the shift linkage and speedometer cable from the transmission.
  • Remove the u-joints and take the driveshaft away.
  • If transmission is equipped with oil cooler lines, remove them also.
  • Place a transmission jack under the transmission to provide support.
  • Unfasten the transmission mount connected to the transmission cross member.
  • Raise the transmission up a little so as to ease the pressure on the transmission mount.
  • Take the cross member out by removing the cross member mounting bolts.
  • Now, let the transmission move down so that you can support it on the transmission jack with the help of chain. Don’t let the transmission hang down.
  • Take off any shields or covers from the flywheel so that you can get at the torque converter bolts easily.
  • Move the crankshaft in a spinning motion unless the torque converter bolts are released.
  • Unfasten the bolts holding the transmission to the engine.
  • Grab and draw the transmission in the backward direction unless it gets out of the engine.
  • With flywheel holding tool, take the flywheel or flex plate out.
  • Examine the surface of the crankshaft carefully for any signs of wear and tear. Replace or repair the crankshaft if necessary.
  • Take a new rear main seal and install it by reversing the entire installation process.
  • Take a small drive and make sure that the replaced rear main seal is properly working.

Further Reading

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