King of Hammers 2017 – Test Ride inside Ultra4 Posted on February 15, 2017 by Mike Caudill Share this:TwitterFacebookLinkedInPinterestTumblr Yukon Gear & Axle hosted us out at the 2017 King of Hammers race in Johnson Valley. The event was huge, larger than we thought! I had a rare opportunity to ride in an Ultra4 Race Car. Incredible!!!!