Below is the factory Dodge unit bearing assembly. Note the use of the adapter and the overhanging load placed on the tighlty spaced bearings. This isn’t a perfect combination and causes premature wear on the unit bearing. With the SpynTec™ dually kit, loads are spread out over a wider area alleviating excessive wear on the bearings. The addition of a Spyntec kit to your truck will not only allow you to grease your wheel bearings, but will also reduce driveline wear by allowing the hubs to free spin, which will also improve your fuel mileage.
Thank you to Roberto Morelli for use of the photos.