what kind of repairs can I expect prior to reaching 60,000 miles what will break

That's how the dealers make money I could do nothing to that car and I guarantee I can get 100.000 out of that

Although the Challenger is a fun car it is rated as a lesses quality vehicle to your prior Nissans. You can do a search to verify but the vehicle should have at least a 3 year/36,000 mile comprehensive factory warranty that covers just about everything. That warranty went into effect on the vehicles in service date (First day of origional purchase). Then it should have a powertrain warranty that should go for at least 5 years/50,000 miles. If the owners manual is in the glove box it will tell you exactly what the car has for a factory warranty. If you are looking at an extended warranty that goes out to 100,000 miles then it would be something to consider but if it just goes to 60,000 miles I don't know if it is worth it.