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Purdy Swoft · 10-18-2019, 04:00 PM

The 28-29 AA trucks used the worm gear style backends .I believe that the high speed ratio was 5.17

I agree with modeleh on post number three ,

5.14 was the ratio for the later spiral bevel backends used on the mid 30 through 31 AA trucks

Most model A pickups on the passenger car chassis used the 3.78 standard ratio .

I think that a 4.11 ratio gear was also available

Some have said that the 4.11 gear was only for special order
I think that a 4.11 ratio was also available

10-18-2019, 04:00 PM	#10
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Model AA High Speed Rear Axel The 28-29 AA trucks used the worm gear style backends .I believe that the high speed ratio was 5.17 I agree with modeleh on post number three , 5.14 was the ratio for the later spiral bevel backends used on the mid 30 through 31 AA trucks Most model A pickups on the passenger car chassis used the 3.78 standard ratio . I think that a 4.11 ratio gear was also available Some have said that the 4.11 gear was only for special order I think that a 4.11 ratio was also available