If you’re serious about upgrading your swingaxle transaxle, swapping the old differential housing for one of these ultra tough Rancho/McKenzie Super Diffs is a must. The new housing allows you to add 2 additional spider gears, distributing power over twice the contact area and providing exceptional strength, durability and longevity. There are also accommodations for 2 heavy duty snap rings on each side to insure the axle end gears stay put under extreme loads. Each Rancho/McKenzie Super Diff comes as shown with the heavy duty steel diff housing, pins and block. Gears not included.