shortening the wheelbase will affect ackerman angle this is why the roadster kept the identical wheelbase to the sierra because it used sierra uprights giving you a steering angle simmular to a setup in a sierra.
1/2" is not much in the grand scale of things but if you where to use a diffrent upright you would need to work out what would be ideal for them.
i did think if anyone realy looked into ackerman angle with the mazda based chassis?
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