Join Date: Apr 2002
Location: Montréal (Québec)
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It's the freehub that's going baloney, so you basically need to replace it. Weakening springs is a typical failure mode, especially if you ride in lots of sticky stuff or below -20 C.
Shimano and Shimano-compatible freehubs are sold separately and relatively easy to change. Last time I changed one, it was 15 or 20 $, installed. Unless you have other problems with the hub or cash to burn, replacing the whole hub (or worst, the entire wheel) is pointless).
Recommendation: Shimano, basically. They are not perfectly silent, but if you compare a Shimano freehub to a DT Hugi, Chris King or Phil Wood, you'll consider the Shimano very quiet indeed.
Other recommendation : learn to pedal most of the time. The freehub clicks only when you coast.