Way back in ‘89 I had my ‘64 box converted to 12.7:1 by Lee Power Steering. The original pump had failed internally (sheared some splines) which prompted me to take both the box and pump in for work.
All in all it cost me $600 for everything which included whatever they charged for another pump core ($60 or so) and a GM filter can ($20) for the return line.
Best upgrade for driving confidence and feel, it really changed my driving experience.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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