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How To: Mustang Rear Main Seal Replacement (1982-2004 3.8L, 5.0L) Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2017-01-13

The rear main seal is located at the back of the engine block and has a very important job of keeping oil inside of the engine while the crankshaft rotates. Since the crankshaft protrudes from the back of the engine block, a seal is required to keep the oil inside of the engine where it belongs.



Most Mustang rear main seals feature a silicone, rubber or Teflon construction which wears out from age and the rotational forces from the crankshaft. Common signs of a failing rear main seal, is oil seepage around the bottom of the transmission, the bellhousing, or the spacer plate.



Replace the worn or damaged rear main seal in your 1982-2004 3.8L or 5.0L Mustang with this high quality rear main seal from Ford Performance!



Mustang Fitment: 1982-2004 w/ 3.8L or 5.0L



Item # LRS-6701A

MPN # M-6701-B302