I'd been pretty nervous about having a mobile service rebuild the differential on my cherry '96 Mustang Cobra. Well, this turned out to be one of the best repair experiences I've ever had. I'd scheduled the appointment for 9am, about a week in advance. Sure enough, at 8:45, I received a text saying that the driver was 17 minutes away. I was lucky enough to have JC work on my car--and let me sit there and watch the process. Within 20 minutes, I knew this guy was a master, who had done it a thousand times. I'm not even exaggerating when I say he could have probably done the job in the dark. JC is meticulous, yet efficient. His skills are impressive to watch. Nice guy too. 2.5 hours later, I was riding around with a fresh diff, and new 4:30 gears. No odd noises. No leaks. Everything is tight and perfect. The 4:30s are a thrill--even driving gently, during the break-in period. The job was a complete success. 5 stars!