I've had some good experience with Williams, but earlier this week was bad. They are either crooked or the mechanic is just really bad at his job. Williams quoted me $2600 on what proved to be a misdiagnosis. It didn't need a clutch kit, and the master cylinder wasn't good like they said. I took it to Wallace Automotive and they diagnosed master cylinder, fixed it for $500, and it's been shifting great today. Go with Wallace even if there's a wait.