Just installed my new Bullydog Torque Dog box today and my clutch just aint havin it. I can slip it on command in 5th and 6th at any speed. I was hoping the clutch would be stouter than previous models but I guess not. Can't complain though, the truck runs better than I expected it would with just an add-on box. The thing I cant get over is how well it runs without smoking like a frieght train like my other trucks used to. If you nail it from right off idle it will smoke thick for a split second and clear up instantly on the high setting. The middle setting smoke is almost non existant and the power is good and strong. 
