John - Before you go "...open them up and do a little cleaning..." you might ask folks for more info on that aspect. These are hydraulic oil filled shocks with springs under tension. If you have never opened one up, you may be in a for an unpleasant surprise! Not to mention a very difficult time putting everything back together.
Edit Note: These are usually sent out for professionals to rebuild as they are not an easy in your garage rebuild from everything I have read. This page in the 1942-47 Shop Manual provides the beginning of shock service info. I would suggest reading all through that info before you try and tackle opening any of your shocks up.
Last edited by Gdads51; 01/21/20254:02 AM. Reason: add Edit Note
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Not to mention a very difficult time putting everything back together. 
