Not exactly the same, but I too went from Toyota to Jeep; 00 Tundra TRD SR5 to a 14 JKUWW.
At the time, my Tundra had ~180k on it, and it was coming up on the major timing belt / water pump service.
The Jeep is better off-road. But, in terms of power delivery, the Toyota 4.7 v8 was a far...