bad knock in supercharger help!

steveos89xr7

Registered User
i have the 10% overdrive pulley and meth injection with 71,000 miles on my cougar, i run washer fluid instead of methonal. i have to rebuild my super charger it has a terrible knock! we just replaced the coupler seemed to be fine for a while then got a lot worse. any ideas why this happened with such low miles? or could be the mods?
 
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