I've read that the newer poly isn't as bad with squeaks as the older stuff, esp if you use plenty of their lube. I plan on doing mine soon. As long as you are replacing you might as well upgrade
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Jim Zorgias
1994 ZR-1 Admiral Blue/Black #245
1996 Callaway Supernatural 450
1990 Callaway Supernatural 490 / CR-1 #7