I have the AASCO lightweight flywheel as well in my SPB. No issues so far. If you talk with JG, he thinks this biggest killer of transmissions is the addition of a higher clamping force pressure plate and aggressive clutch plate. He suggested to me to stay with stock with those two items, and I did.
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Tim
1998 986 (daily driver Frankencar)
1999 986 (SPB)
2001 986 S (parting)
2015 981 (sold)
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