I guess I can understand your concerns of "high rpm". But it ISN"T high. 5000 RPM is nothing. You can certainly develop the same pulling power via trans shift points but guess what, go the same speed you will be at a lower RPM but at a corresponding higher point in torque. High RPM (the RPM we are talking about here.) is nothing and causes no damage. Now lets talk about torque. It beats the rod bearings, the crank, rings, cylinder tops and more. If it takes 300HP to move it up the hill, you can do it with 300 lbs of torque at 5200+ RPM, or you can do it at 450 lbs of torque at 3000+ RPM. Where is the engine taking the most beating? At 450 lbs of torque. At 5200 the only thing getting worked hard is the muffler. The engine, trans and ECU were designed to give you the most efficiency and life expectancy. You can buy lots of different shift kits, you can re-program the Trans shift points and engine rev limiters. All to your dismay. Follow the owners manual and common sense and you will get the most life out of your drive train.
Jim and Katy
w/ Shelby and Sealy (Bernese Mountain Dog and a Nice Mut)
HAM CALLSIGN - AI4SR
EE, IBMer, Race Car Builder, now Retired.