I used Portland for the custom d/s for my manual conversion and they did a great job. Absolutely no vibration or imbalance issues and all new components for the rear CV joint, center bearing, & front spiders. There is also Driveline services of Atlanta, not sure if they're an affiliate and have no feedback on them. Thrash in San Antonio, TX is supposed to be very good and are a bit cheaper than Portland. I didn't learn of them until after doing the swap.