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Old 02-13-2004, 08:43 AM
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Question Model A Front Suspension

Re: 1930 Ford Model A pickup (fendered with bumper). I am using a stock ibeam axle, split wishbones, and low profile 15" wheels. I want to keep the truck stock looking as much as possible.

I can either get a low profile posie reverse eye spring and altered front cross member to give me a 4" drop or I can just use a dropped axle. The first way is alot cheaper and easier .

If I go with dropped axle there is ibeam and tube. Which is better? If I decide to get rid of the wishbones, what are the pros and cons of hairpins vs four bars?

I do not want to bottom out on speed bumps. Help?

Larry

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Old 02-13-2004, 08:54 AM
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You need a I beam...not a tube.

With the split wishbone...the tube axle will be more prone to break. The I beam will not........it flexes a little.

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Old 02-13-2004, 09:15 AM
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Re: Model A Front Suspension

Quote:
Originally posted by loiselle

I can either get a low profile posie reverse eye spring and altered front cross member to give me a 4" drop or I can just use a dropped axle. The first way is alot cheaper and easier .
Actually it is easier to install a dropped axle than to change the front crossmember.

Quote:
If I go with dropped axle there is ibeam and tube. Which is better? If I decide to get rid of the wishbones, what are the pros and cons of hairpins vs four bars?
An I Beam is preferred when using split wishbones for the reason stated by Deuce; however recent testing has shown that to be less of a problem than originally thought.

Due to the limited travel of the suspension, I don't see much advantage of using split wishbones vs. hairpins vs. 4 bars. However, the 4 bars do work much better with either cross steering or when using a Mustang steering box to eliminate 'Bump' steer.
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Old 02-17-2004, 05:49 PM
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Split wishbones or hairpins have a tendency to put a lot of torsional strain on ANY front axle that you choose (unless it is a triangulated system). The best street set-up is a 4 bar setup, as it allows the front suspension to have complete twisting travel with out putting anything in a bind.
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