wanted cage for 29 worm drive

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njcar757
Posts: 67
Joined: March 4th, 2009, 4:00 pm
Body Type: closed cab
Model Year: 1929

wanted cage for 29 worm drive

Post by njcar757 » July 20th, 2017, 6:23 am

The part I need is the part that has 8 holes and bolts to the worm gear, I think its called a cage, part # AA 4205, one side of mine is cracked and I don't want to weld it.
thanks nick c

Stakebed
Posts: 1059
Joined: June 14th, 2007, 7:29 pm
Body Type: Grainbox
Model Year: 1929
Location: Illinois

Re: wanted cage for 29 worm drive

Post by Stakebed » July 20th, 2017, 6:41 am

are the halves identical? And your for sure its a 29 worm drive with 4 spider gears? I may have one... Will have to check...

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Neil Wilson
Posts: 2469
Joined: February 5th, 2003, 9:42 pm
Body Type: 89-A
Model Year: 1930
Location: Boulder, CO
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AA-4205 as the "differential gear case"

Post by Neil Wilson » July 20th, 2017, 7:39 am

njcar757 wrote:
July 20th, 2017, 6:23 am
The part I need is the part that has 8 holes and bolts to the worm gear, I think its called a cage, part # AA 4205, one side of mine is cracked and I don't want to weld it.
thanks nick c
All Ford Parts Price Lists shows AA-4205 as the "differential gear case" (2 per truck). The part id was assigned an "AR" suffix even thou it was a production part. This was TT-1028-B (i.e. a TT carryover part). The "AR" suffix assignment is unusual. Most worm drive parts are listed with this suffix. This part is many time cracked.
Regards, Neil Wilson
______________________________________
neilwilson.aaford@gmail.com - use this email for contact
www.aafords.com - AA information and photographs

njcar757
Posts: 67
Joined: March 4th, 2009, 4:00 pm
Body Type: closed cab
Model Year: 1929

Re: wanted cage for 29 worm drive

Post by njcar757 » July 20th, 2017, 1:40 pm

The halves are the same, both AA 4205, with 4 spider gears.
nick c

Stakebed
Posts: 1059
Joined: June 14th, 2007, 7:29 pm
Body Type: Grainbox
Model Year: 1929
Location: Illinois

Re: wanted cage for 29 worm drive

Post by Stakebed » July 20th, 2017, 8:19 pm

Sorry ill have a look tomorrow (Friday) no fun being outside in the 97* heat and humid as all hell... :evil:

njcar757
Posts: 67
Joined: March 4th, 2009, 4:00 pm
Body Type: closed cab
Model Year: 1929

Re: wanted cage for 29 worm drive

Post by njcar757 » July 23rd, 2017, 4:46 am

Does anyone here have a theory on why they crack?
nick c

KimVanOrder
Posts: 364
Joined: August 11th, 2013, 4:25 pm
Body Type: 82-A Platform
Model Year: 1928
Location: Hamilton, Mich.

Re: wanted cage for 29 worm drive

Post by KimVanOrder » July 23rd, 2017, 4:04 pm

njcar757 wrote:
July 23rd, 2017, 4:46 am
Does anyone here have a theory on why they crack?
nick c
TT leftover part used on a 1-1/2 ton truck. Just too week. Same reason Wheels, and frt. axel were upgraded. Just too week. No Finite Element analysis back then. Just, " lets try this" engineering. :shock: :lol:
KVO
Dec. '28 AA

Stakebed
Posts: 1059
Joined: June 14th, 2007, 7:29 pm
Body Type: Grainbox
Model Year: 1929
Location: Illinois

Re: wanted cage for 29 worm drive

Post by Stakebed » July 24th, 2017, 7:44 pm

Well crap - i have 2 halves - one an axle bore into the end and was "fixed" my a large fat washer. That half is cracked. The other half that looks to be great shape I sandblasted it and thought it was good but upon close up inspection has a few tiny micro cracks barely visible to the naked eye on the support ribs...

Heres my theory - noones going to load 5 tons of crap in the back of an AA anymore and drive up a 20* gravel grade. There is an awful lot of meat on those parts even if they are cracked so how hard do we have to worry about them?

Also are you sure with a sandblasted part and a magnifying glass your "good" half isnt also cracked? I find it weird one half would and other half not...the one i thought was good you can just barely see the cracks with the naked eye and i have 20/20 vision...
Last edited by Stakebed on July 25th, 2017, 6:17 am, edited 1 time in total.

Stakebed
Posts: 1059
Joined: June 14th, 2007, 7:29 pm
Body Type: Grainbox
Model Year: 1929
Location: Illinois

Re: wanted cage for 29 worm drive

Post by Stakebed » July 25th, 2017, 6:16 am

double post....

KimVanOrder
Posts: 364
Joined: August 11th, 2013, 4:25 pm
Body Type: 82-A Platform
Model Year: 1928
Location: Hamilton, Mich.

Re: wanted cage for 29 worm drive

Post by KimVanOrder » July 25th, 2017, 4:07 pm

njcar757 wrote:
July 20th, 2017, 6:23 am
The part I need is the part that has 8 holes and bolts to the worm gear, I think its called a cage, part # AA 4205, one side of mine is cracked and I don't want to weld it.
thanks nick c
Nick: think this through. A part that will never be seen, the truck will probably never carry a 'Load" again. ( just parade and grand kid duty). I think I'd weld it up. A lot. make it stronger than it was and use it. Let me know how it goes. I have one hanging on the wall, but would like to keep it. Just in case.

KVO
KVO
Dec. '28 AA

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