Ford Mustang Rear Main Seal Install

Posted 2/7/2017 by Tyler Rodriquez

A leaking rear main seal on your Mustang can cause not only a stain in your garage, but a headache if you don't fix it before it gets worse. Follow along as we walk you through this easy install.

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The hardest part of installing a new Mustang rear main seal is getting to the actual seal. This is a part you will want to replace if you already have your transmission out even if it is not leaking. This is cheap insurance to prevent future leaks.



Tools Required:

  • Small Flat Head Screwdriver
  • Small Amount Of Fresh Oil
  • Quality Brake Clean
  • Hammer
  • Small Drift


Step 1:
Remove the transmission, clutch, flywheel, & spacer plate. These steps can be found in our AOD To T5 Swap Stage 3 & AOD To T5 Stage 4 videos.



Step 2:
Using a small flathead, pry the old rear main seal from the engine paying close attention to the orientation of the seal.



Step 3:
Clean the area with quality brake clean and a clean towel and inspect for any damage or foreign materials that may be present.



Step 4:
Once the area is clean, apply a thing coat of fresh oil to the new seal and place into position.



Step 5:
Lightly tap the seal into place with a hammer and small drift until it is flush with the engine block.



Step 6:
Reinstall all of your transmission components and you are done!