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About the only way would be to inspect the bearing. The more miles the sled is ridden, the more wear on the bearing. Usually, when a bearing fails, it does show it's failing a while before it completely comes apart. Any up/down movement on the drive shaft should let you know bearings are going, as well as any abnormal noise coming from that area.
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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php
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