Tough trails, tough axles. Dynatrac is back and underneath our Ultimate FJ this year, right where they have been the past several years as the Official Axle of the UA. The Dynatrac crew has been at work on axle assemblies even before we obtained our Ultimate FJ. Welcome back. SOURCES Dynatrac Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!