Worm drive tag

AA Ford Discussion Group relating to the repair and restoration of your AA Ford.
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Lewisag1
Posts: 15
Joined: September 4th, 2019, 7:50 pm
Body Type: 88-A
Model Year: 1928
Location: New Berlin, IL

Worm drive tag

Post by Lewisag1 » January 31st, 2021, 7:34 am

I’m diving in to the disassembling, inspection, and restoring the worm drive rear axle on my late 1928 AA. There is a round tag hanging from the safety wire on the bolts for the tube to differential housing. Does anyone know what this might be for? There are no numbers or letters stamped in the tag, so I assume there was probably an information decal on the tag at one time. Didn’t know if this was placed on there at the factory or if it was to show some kind of service work performed in field?
Thanks,
Doug
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KimVanOrder
Posts: 708
Joined: August 11th, 2013, 4:25 pm
Body Type: 82-A Platform
Model Year: 1928
Location: Hamilton, Mich.

Re: Worm drive tag

Post by KimVanOrder » January 31st, 2021, 8:32 am

It may be to show the gear ratio has been changed from what is stamped on the housing.. So you will have to check the ratio. Can do via counting drive shaft rotations to wheel rotation. Be sure to keep the tag!!!
KVO
Dec. '28 AA

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Chris Haynes
Posts: 2140
Joined: September 7th, 2003, 5:18 pm
Body Type: 82A
Model Year: 1930
Location: Camarillo, CA

Re: Worm drive tag

Post by Chris Haynes » January 31st, 2021, 1:53 pm

KimVanOrder wrote:
January 31st, 2021, 8:32 am
It may be to show the gear ratio has been changed from what is stamped on the housing.. So you will have to check the ratio. Can do via counting drive shaft rotations to wheel rotation. Be sure to keep the tag!!!
Or, if the speedometer is accurate, look at the ratio stamped on the speedo drive gear.

Lewisag1
Posts: 15
Joined: September 4th, 2019, 7:50 pm
Body Type: 88-A
Model Year: 1928
Location: New Berlin, IL

Re: Worm drive tag

Post by Lewisag1 » January 31st, 2021, 3:12 pm

The housing is stamped with the letter “B” to indicate the 5.17:1 gear ratio. Truck is equipped with the dual high option, so I would assume that the gear ratio is the high speed. I’m wondering if the end cap for the screw thrust bearing was replaced under a recall? The safety wire was not on the four bolts? I’ll know more once it is apart! :!:

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Chris Haynes
Posts: 2140
Joined: September 7th, 2003, 5:18 pm
Body Type: 82A
Model Year: 1930
Location: Camarillo, CA

Re: Worm drive tag

Post by Chris Haynes » January 31st, 2021, 3:28 pm

The '30/'31 High Speed units had a brass tag. Some with a number and others without.

Lewisag1
Posts: 15
Joined: September 4th, 2019, 7:50 pm
Body Type: 88-A
Model Year: 1928
Location: New Berlin, IL

Re: Worm drive tag

Post by Lewisag1 » February 5th, 2021, 3:49 pm

I finally got it disassembled and counted number of teeth. Ring gear has 31 teeth and the pinion(worm gear) has 6 which yields 5:17:1gear ration, high speed gear. Still guessing what the brass tag was for?
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KimVanOrder
Posts: 708
Joined: August 11th, 2013, 4:25 pm
Body Type: 82-A Platform
Model Year: 1928
Location: Hamilton, Mich.

Re: Worm drive tag

Post by KimVanOrder » February 6th, 2021, 5:36 pm

Maybe,, Just to drive you nuts!!!! :lol: :lol:
KVO
Dec. '28 AA

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1crosscut
Posts: 850
Joined: December 25th, 2010, 7:22 pm
Body Type: 82-A
Model Year: 1929
Location: Lincoln, NE

Re: Worm drive tag

Post by 1crosscut » February 6th, 2021, 6:43 pm

I've seen a blank one like yours on a worm drive rear end too.
------------
Dave

Lewisag1
Posts: 15
Joined: September 4th, 2019, 7:50 pm
Body Type: 88-A
Model Year: 1928
Location: New Berlin, IL

Re: Worm drive tag

Post by Lewisag1 » February 8th, 2021, 7:39 pm

Must be something to it! It would be interesting to know the purpose.

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