Frankly the gears are not going to wear out the engine sooner then blowing it up at track so who cares! I run3.91-4.10s with 25 tall tires and have run 4.30s and 4.56s for close to four years and have driven them for hours at a time. If your cooling system is good and engine in tune a bit of 4000 will never hurt it I run LT tires with the 4.56s too much worry for nothing besides you won't get the tickets for speeding going 60-70mph on the interstate