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Message: <blockquote data-quote="Okie4570" data-source="post: 4134461" data-attributes="member: 15643"><p>I've always wondered about this. I've changed lot's of ring and pinion gears over the years in my broncos, daughter's jeep and some 3/4 ton trucks and Excursions as well as some for friend's vehicles. Every one of them says to change after the first 500 miles. No new vehicle comes with 500 miles, nor is there ever a suggestion to change it until the recommended changing interval which is sometimes 100k miles. New difs don't seem to be wearing prematurely without the break in change in any make or model. Are the ring and pinion parts companies pulling one over on us?? <img src="/images/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" /></p></blockquote><p></p>