I don't understand the 3000 rpm at 60 mph with a 3.54 rear gear. If you have stock tires around 28" tall, the rpm should be more like 2550, and about 2722 with a 3.78. A 4.11 calculates to 2959 rpm at 60.
Using this calculator:
https://spicerparts.com/calculators/...rpm-calculator