 The Synergy kit creates loads...  The Synergy kit creates loads of wheel travel with ample space beneath the fenders for up to 37-inch tires. The 4.5-inch system is shown in use with a set of 35x12.50R17 Toyo Open Country M/T tires on the stock wheels. Spidertrax wheel spacers were used to keep the tires from rubbing. |  The 35x12.50R17 Toyo Open...  The 35x12.50R17 Toyo Open Country M/T tires are a great fit with the 4.5-inch Synergy kit. The kit will also easily clear 37s but we elected to stay a bit smaller since we didn't plan on changing the axle gears right away. |  Ground clearance is greatly...  Ground clearance is greatly improved with the Poly Performance Synergy kit in place. |