My bevel box was screaming like a banshee. Years ago the diffs in the old cars used to whine and scream so we removed them, had them lapped and refitted them with pleasing results. The bevel box in the 3 wheeler is no different. There is a simple solution. Remove the bevel box send it to be stripped down and lapped reinstall it and you have a quiet bevel box. The dealer here in Brisbane (3 point classic) did this to their demo 3 wheeler and my 3 wheeler and they are as quiet as a mouse.
