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H. L. Chauvin · 08-17-2014, 04:34 AM

FWIW:

Model A differential growls with worn new or old differential gears can be strictly differential RPM related.

It very well could be that both second & third can get enough differential RPM's to create the growl; however, in first, you may not create enough differential RPM's to make it growl.

I have a differential that will growl from 30-35 mph in third -- this sound was my speedometer to avoid getting a speeding ticket in a 35 mph speed zone in the 1950's -- once passed 35 or under 30 mph, all of the growling stopped.

On a Model A differential rebuild, take very cautious note of not only drive pinion gear/ring gear contact in center of teeth on forward drive; but also notice the curved ring gear to pinion gear center contact on coasting.

Just sharing one "past" growling experience.

08-17-2014, 04:34 AM	#5
H. L. Chauvin Senior Member Join Date: May 2010 Posts: 4,179	Re: Can't seem to locate a growl FWIW: Model A differential growls with worn new or old differential gears can be strictly differential RPM related. It very well could be that both second & third can get enough differential RPM's to create the growl; however, in first, you may not create enough differential RPM's to make it growl. I have a differential that will growl from 30-35 mph in third -- this sound was my speedometer to avoid getting a speeding ticket in a 35 mph speed zone in the 1950's -- once passed 35 or under 30 mph, all of the growling stopped. On a Model A differential rebuild, take very cautious note of not only drive pinion gear/ring gear contact in center of teeth on forward drive; but also notice the curved ring gear to pinion gear center contact on coasting. Just sharing one "past" growling experience.