I just bought my first ATV, a 2006 TRV 500, or is it 500 TRV, anyhow... I want to thank everyone for all the great info on this site it really helped me make my decision. My question is do I need to change the front and rear differential after the first 100 miles? The dealer said it's not required but should be done. I found lots of info on the oil changes but nothing on the front/rear differentials. I apologize if it's been addressed but I didn't find any info in my searches. Thanks again for all the great info, I look forward to joining the AC group after the wife FINALLY gave in!