Power Steering for AA Truck

Well, if you stick with the "ArmStrong" steering you have now, you'll save big bucks by not needing a gym membership!
 

Wow, what a fabulous response from all of you :)

My AA is fully restored and the steering box and all suspension and steering components are rebuilt. When I jack it up, I can turn (not rotate)(yes that too) the front wheels easily and the steering wheel spins. It's definitely lubricated, so there are no problems with the truck being old and stuck.

I have desided to install a F100 steering box. The worm and roller type will give less friction and 18:1 ratio over 15:1(I hope those numbers are correct) will probably be enough to make me happy. If not, I will instal an electric PS under the dash later.

Again, thank you all!
 

I checked the A Forum and found that the AA steering box ratio is 13:1, not 15:1 as I mentioned.

Close to 30% less resistance from the steering wheel and probably even better with the F100 box :D

This is PS .....
 

The ratios are a bit confusing. The information on the net is varreing as usual, but 13:1 for model A and 18:1 for F100 seems to be the most common values. But I take it for granted that the information from Randy Gross is correct, raising the improvement to 35%. It can't be any need for power steering after this!

Chris;

A F100 box has a 17 to 1 ratio

A standard 2 tooth or 7 tooth Model A box has a 11 to 1 ratio

Thanks

Randy Gross
Mel's Model A Parts & Services
904 North 3rd Street
Montebello, CA 90640
(714) 292-8660
 
The big thing which overrides the actual ratio is the efficiency. The roller segment helps a lot. As the cars got bigger and heavier even Ford went over to the roller segment boxes starting in 1937.

Mart.
 

Very true Mart and I mentioned that too. The steering boxes of ball screw type are even more efficient, but it doesn't seem to be any of that type, that will fit reasonably well.

Chris

 
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I haven't done it yet but, my plan for my F3, is to use a double acting cylinder on the drag link to frame and then using a servo, from a stock car or Sprint car, on the steering shaft, connected to the power steering pump and then to the cylinder.
 
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