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The Ford shocks came with castor oil in them Ford part number 8A-19541-A or the preceding part number. This stuff gets thick after 50 plus years. If you wish to add fluid to your shocks, you can get castor oil at the DRUG STORE!! Do not add jack oil or other similar fluid.
Your best bet may be a rebuild by Bill Wzorek.
Don't expect your 37 Ford to take bumps like a modern car even if your shocks are perfect. All shocks do is slow down rebound, they don't soften the ride.