well I will be needing a quad cab. Thinking that I would prefer to stay with the 305/555 engine for simplicty sake? I was getting ready to drop the dollars on a new GB auto for the current truck. How do people like the NV5600? Is the clutch and 6th gear the only two weak points? I drove an 09' G56 yesterday, how would that compare to the NV5600 shifting wise?