I always tell everyone I see every chance I get that this is the single best thing you can do these old cars to improve the feel of the car. It just makes the cars so much more enjoyable to drive. And most people don't believe it until they actually do it.
And those of you who upgrade the internals of the box, know that the torsion rod in the spool valve is what determines the effort required, and upping the effort is equally important to the 12.7:1 ratio. Just changing the ratio isn't enough. The Jeep box or WA-code MonteCarlo SS box or various 9C1-option Caprice boxes is the way to go.
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