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Message: <blockquote data-quote="sawright" data-source="post: 27308" data-attributes="member: 1754"><p>I have an 02 773G with 1200 hours. It has Grouser OTT. When traveling under load, like pushing up an incline with a full bucket of clay, I hear a rumbling sound that sounds like its coming from the chain box. Not real loud, but noticeable when operating at 3/4 throttle. It does not make the sound when traveling under light load, maybe just a quiet chittering, mostly when turning right (using left side final drive) at high speed. Any thoughts as to what this might be, whether I should be worried and how to diagnose it? Thanks, Steve</p></blockquote><p></p>