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If you are meaning the Rear Main Seal, it is the seal that goes around the crank shaft where it comes through the end of your motor and attaches to your transmission. To get to it you have to split the motor and the transmission.
He asked “was it the RMS” not “what is the RMS” !
Ha! You’re right! That attention to detail is going to take me places in life.
Valley plate gasket maybe?
