Ive got an 05 Dakota with a 4.7 now - trans just lost 3rd gear but the 4.7 is still good at 155K. I had an 01 Grand Cherokee that had 288K on it when I sold it and it was still running great. That said - 4.7's get lousy mileage Both my full size 5.7 trucks got better mpg with 50% more power to boot.