Am a newbie here. Have a 2019 LT4 8L90 connect and cruise package in my 66 C10. Since I've been on the road I noticed that the driving rpm's seem low. Works well otherwise. Driving around at 30 mph in auto rpm is 1000. Stays there until your on the highway and in 8th gear and goes up with speed. Speedo was good out the gate. I used the Gear/tire wizard to input my 3:73 gear and 31" tall tires with no real change. I have searched on how to increase minimum driving rpm many ways with nothing found. Looking for guidance.