the rear main seal is the seal located at the back of the engine which keeps the oil in. the crank runs through it they usualy don`t go but is still good to check it every once in a while .to get a good look at it or to replace it you will have to unbolt the tranny and remove the flywheel to get acces to it i`d say replace it if you upgrade your clutch definetly not hard to do if you don`t have any oil puddles on the ground or bad clutch slippage you should be good
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