A big mistake I made in going with a 9" Ford with 350 gears. The fabrication was done by an out of town shop. The gears they used had to be made in China. They growled on first drive. We called and then sent them back after listening to a bunch of......... When we got them back with no explanation. the second set did the same thing. If it hadn't been for marking the 1st set I would swear they sent the same ones back. My calls were not answered the second time around. Now looking to change.