Quote: ok, so what exactly makes them howl? I have a set of 4:10 Richmond that howl like crazy. when everyone says they are not set up right, what is not right??
I would think the checking depth on the pinion would be the problem. As to whether it is too deep or too shallow you can't see by simply looking at it. As to how to get it out I don't think I would change the checking depth once the gears have been ran. You can check the backlash and adjust it yourself with a dial indicator. I set the backlash years ago on one and never had an issue (removed an open carrier and installed a clutch pac) I got a bad feeling the 391's I just set up are going to howl. I don't have them in yet and it may not be an issue but it was hinky trying to set the backlash...almost .003 difference measured on the ring gear at 4 different locations.
