Rear axle swap

AA Ford Discussion Group relating to the repair and restoration of your AA Ford.
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Jdmiller
Posts: 2
Joined: January 21st, 2019, 9:09 pm
Model Year: 1929

Rear axle swap

Post by Jdmiller » January 26th, 2019, 9:25 pm

My first "AA" and my first post. Probably a stupid question, but here it goes;
Has anyone here had any experience swapping a late flathead rear axle (1947 Ford) passenger in a "AA" axle ?
I have no plan to haul heavy loads but I would sure like to drive the truck at least 45 without pushing RPMs very high.

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Chris Haynes
Posts: 2085
Joined: September 7th, 2003, 5:18 pm
Body Type: 82A
Model Year: 1930
Location: North Hills, CA/ Pine Grove, CA

Re: Rear axle swap

Post by Chris Haynes » January 26th, 2019, 9:52 pm

Passenger rear end won't fit in an AA. A High Speed rear end and a Mitchell overdrive will achieve your desired results.

Jdmiller
Posts: 2
Joined: January 21st, 2019, 9:09 pm
Model Year: 1929

Re: Rear axle swap

Post by Jdmiller » January 26th, 2019, 10:15 pm

Yah, I was affraid of that. I'll do some learning about the Mitchell's. I would want to swap my worm drive and install a 30/31 high. Thank you for your help.

User avatar
Chris Haynes
Posts: 2085
Joined: September 7th, 2003, 5:18 pm
Body Type: 82A
Model Year: 1930
Location: North Hills, CA/ Pine Grove, CA

Re: Rear axle swap

Post by Chris Haynes » January 26th, 2019, 11:28 pm

They did make high speed worms.

RustydoubleA
Posts: 108
Joined: June 18th, 2014, 10:22 pm
Body Type: express
Model Year: 1930
Location: N. Calif.

Re: Rear axle swap

Post by RustydoubleA » February 16th, 2019, 12:05 am

Hi, I put Model A car axles under a 29 chassis with late 30 sheetmetal and early express box. Extended the driveshaft torque tube about 8 1/2". 4 speed, 28 underdrive behind that. 7.00 X 19 tires on stock Model A rims. weighs 800# less than with stock axles. 40's hydraulic brakes. Will do 55 mph with ease. Model B engine, 5.5 to one head, B carbs. lightened flywheel for easier shifting. Those stock axles weigh so much, you are pushing that engine with an overdrive. What to do? Easy! Keep one mostly stock to look at/use around the property then have a second one modified to drive, then make a third one with all of the spare parts that you collect.
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