That was an interesting string. I have to admit that at first I thought it may be an old wives tale that type of spring impacted traction. After a static diagram or two it is clear there is a relationship between spring rate constants (stiffness) and keeping near equal weight on both wheels on uneven ground to keep one from spinning. Leaf springs are used in heaver automotive applications. Thus making it appear the leaf springs are bad for traction when actually a stiff heavy duty coil spring would not necessarily perform better. Summary - flat ground it makes no diffence. If one rear wheel is on a hump and the spring is stiff, that wheel picks up much more weight which is what causes the spring to compress. Weight is no longer split 50/50 between wheels and spinning is more possible. If the spring is less stiff much less weight is used to compress the spring to compensate for the hump and weight split is closer to 50/50 thus more traction. On paper does the spring rate constant make a diff - yes. In real life does it make enough impact to matter to you? You get to decide.
Now to go further out on that limb. The front springs change things as well even on 2wd. The front springs resist the vehicle tilting when one of the rear is on a hump. Softer front springs allow the vehicle to tilt more which in turn allows the back spring on the hump to have to compress less. Less difference between rear spring compressions means closer to 50/50 weight distribution for optimal traction. Soft long travel springs all the way around provide better starting traction all other things the same.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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