MTFCA Forum

I am rebuilding the rear axle on my 1927 Touring and I am probably being to picky on some of these dimension.
What is an acceptable clearance on the axle shaft gear shoulder in the differential housing, I've read the gear shoulder should be 1.807" and .010" clearance is acceptable, so the differential housing could be up to 1.817"
How much wear can be on the inside face of the differential housing.

Wear where the axle gear flanges sit is not critical. I suppose its possible there could be too much wear from running dry, to disengage the spider gears, but the carrier would be obliviously worn beyond use. Any actual wear here is taken up by the spacer between the 2 axle shaft ends.
This spacer is/was a fiber disk(s) fit to take up all the end play. Axles should be just able to turn freely. About .005". Contemporary spacer methods include fitting a ball bearing, hard aluminum, brass or phenolic spacer disks.

speedytinc wrote: ↑

Fri Dec 23, 2022 4:32 pm

Contemporary spacer methods include fitting a ball bearing, hard aluminum, brass or phenolic spacer disks.

... or a quarter.

Is .010" wear at the gear shoulder acceptable, up to 1.817"

Yes, but that's the upper limit of what I would use. And then only
if the side to side clearance of the carrier and thrust washer assembly inside the axle housings is small say 5 to 10 thou. The idea is to maintain the ring gear in a vertical position.