Just put a set of used gears back in the van, 4.10, got the pattern in the middle and bl +_.005. Pretty quite except where I ran the disc over 3-4 teeth that was rust-pitted (water in the other housing) sounds like train on a track, but only up to about 20 mph. I can live with it till I find a better set. The pinion I took out had the teeth rounded over along the spine, I'm thinking pinion bearing went out from a previous owner and they just installed new bearings.