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Yes. DOT3/4 are compatible bases. In fact I think it's Valvoline makes a DOT3/4. It's one fluid sold as being both. I'd still flush it and go to just new DOT4 though.

Reference here:
Brake fluid - Wikipedia, the free encyclopedia
Both are glycol-based, as well as DOT5.1
+1. If you've never flushed your brake fluid system this would be a good time to do it, but yes you can mix 3 and 4.
 

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not too old of a thread, but I am getting SS brake lines, how much brake fluid will I need if I am doing a whole flush?
 
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