Shops/parts to rebuild manual steering box and change ratio

[Jeff H]

Does anyone have a suggestion for a shop to rebuild a 5679142 Saginaw manual steering box and change the ratio? I have a dated box for my 69 Z28 but it's 6-1/2 turns LTL and I need it changed to the quick ratio 3-1/2 turns LTL. I reached out to Lee mfg and waiting to hear back from them. I was also wondering if there is a source for the internal parts to change it to quick ratio. I contacted Borgeson but they only sell new units.