Because the trans mounts are fluid filled, they will start to leak when the rubber breaks down far enough. Until they leak, its hard to know how far gone they are without removal - and once you've removed them you might as well replace 'em. Once one of them leaks, replace both.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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