I appreciate you calling us first and giving us a chance to actually figure out what the issue is.
Just a little background. We have been building and shipping axles for the last 15 years. We have approx 2500 axles that we built and shipped in vehicles not to mention the couple thousand we have built in house for local customers.
A pro rock for instance is built with many different components , ring and pinion , locker, bearings, seals and a yoke. We do out best to ensure that each and every component is perfect when we install. But for example when it comes to something like a seal nobody ever knows how long it will last could be 10 miles could be
If a ring and pinion is not set up correctly a few things will happen .
1. It will usually make noise
2. It won't last long at all. Usually less than 100 miles and something will fail.
I would really like to find out what your issue is so I can determine what we can do for you. 20,000 miles is actually a lot of miles on an axle to have a ring and pinion not set up properly and not have failure or noise.
If the pinion doesn't have in and out movement but it has left and right my first thought is the pinion yoke tolerance may be more than normal. If the bearing preload was to loose you would see in and out movement and noise. If it was to tight it would create noise and fail much earlier than 20,000 miles.
We are here to help as best we can but we have always found that the customer must be willing to help us figure out what the problem is and work with us for a solution.
Have a happy fourth!