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Joe K · 08-10-2019, 01:21 PM

Not Jim but one way to check would be to mount the trumpet end of the housing against a face plate of a lathe and "spin" the housing to check for run-out of the small end.

An acceptable mount match would be the flange of the housing. One could bolt a pumpkin/banjo to the faceplte (check for run-out of pumpkin flange too before adding on) and then mount the trumpet housing to this.

A lathe chuck directly to the trumpet flange could do this less accurately.

Given the looseness of the Model A differential housing cage/gears (0.010 is target backlash) it would take a considerable amount of warp to condemn a housing.

On assembly, one would want to be sure the axle shaft can be held "centered" in the small end of the housing with little or no side pressure (so you don't wipe out the seal at this point.)

Joe K

08-10-2019, 01:21 PM	#15
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Rear Axle Messtoration Not Jim but one way to check would be to mount the trumpet end of the housing against a face plate of a lathe and "spin" the housing to check for run-out of the small end. An acceptable mount match would be the flange of the housing. One could bolt a pumpkin/banjo to the faceplte (check for run-out of pumpkin flange too before adding on) and then mount the trumpet housing to this. A lathe chuck directly to the trumpet flange could do this less accurately. Given the looseness of the Model A differential housing cage/gears (0.010 is target backlash) it would take a considerable amount of warp to condemn a housing. On assembly, one would want to be sure the axle shaft can be held "centered" in the small end of the housing with little or no side pressure (so you don't wipe out the seal at this point.) Joe K __________________ Shudda kept the horse. Last edited by Joe K; 08-10-2019 at 01:27 PM.