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Rear axle swap

Posted: January 26th, 2019, 9:25 pm
by Jdmiller
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.

Re: Rear axle swap

Posted: January 26th, 2019, 9:52 pm
by Chris Haynes
Passenger rear end won't fit in an AA. A High Speed rear end and a Mitchell overdrive will achieve your desired results.

Re: Rear axle swap

Posted: January 26th, 2019, 10:15 pm
by Jdmiller
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.

Re: Rear axle swap

Posted: January 26th, 2019, 11:28 pm
by Chris Haynes
They did make high speed worms.

Re: Rear axle swap

Posted: February 16th, 2019, 12:05 am
by RustydoubleA
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.