I'm considering installing a 3:73-1 diff. into my 11' R/T auto to make it easier for her to get moving from a dead stop. I'm aware that she'll be running higher rpms than with the current 3:06-1 gearing. The rear tires are 345/45 r20. What may be some pros and cons when it comes to drivability, mileage & performance of the 3:73 or even the 3:93 verses the 3:06?