Look for the Unlimited to slice another couple tenths off its 0-60 time if Kenne Bell is successful in another of its computer-tweaking efforts. To smooth shifts, the stock transmission computer shuts off fuel supply and retards ignition just before upshifts. This is the digital equivalent of a very slow upshift and feels especially punitive under boost. However, the proper code changes have so far been elusive.
Super-wide Goodyear Eagle F1s, size 295/45ZR18, on 8.0-inch-wide Prime 122 wheels helped raise maximum lateral grip on the skidpad from the stocker's lowly 0.75g to a whopping 0.87g for the Unlimited. New stiffer springs drop ride height almost 2 inches up front and a full 3 inches in back. There are also stiffer anti-roll bars and Bilstein shocks. However, the suspension mods need additional tuning: Despite the sticky Goodyears, slalom speed was only 1 mph quicker, at 62.5 mph, than the stock Limited. The Unlimited suffered from both off-throttle oversteer and power-on understeer, like a lot of high-powered all-wheel-drive sports cars. In extreme corners the Unlimited rolled on its springs to one position, paused a beat, and then rolled a bit farther. My guess is that the rear shock valving wasn't in tune with the front. At 136 feet, its 60-0 mph stopping distance was a mysterious 6 feet longer than the unmodified vehicle.
The Unlimited got few exterior changes beyond the sterling silver BASF paint job, which we bathed in dust during our photo shoot. If you're tired of the sedate pace in the SUV lane, take your Grand Cherokee-and about $15,000-to Kenne Bell and it'll be Limited no more.