Per the comparison I posted earlier the S60 is only 20lb more than a 12-bolt. I have the S60 in my GTO, tru-trac w/410, no complaints after 10k miles
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66 GTO, 495, M22, Strange S-60 w/4.10
Sold new at Royal Pontiac (Dealer# 07-679)
70 Formula 400/auto
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