You may want to change the pressure relief valve in the pump. It is accessible at the high pressure hose port. Later years used a different spring./spool setup and may not work properly with the older steering box--or, if you have a later steering box, the original pump pressure control may not work.
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'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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