What are the differences between a pre-64 and a post-64 Model 94 Winchester?

ZM

To start, safety devices.

As I recall, the post 64's use cheaper parts, roll pins instead of solid pins, wood is cheaper, not as nice a job of fitting. Post 64's are reliable, safe and good shooters, but a cheaper mechanical design. Thats my take on it, for what it is worth.
Good luck and good shooting

I think there are 3 different versions, pre 64, then a transitional post 64, then then model currently in production. I have an early post 64, it's ugly, I bought it cheap, but it is fantasticaly accurate, under moa for 5 shot's with open sight's!

I just bought an early post-64. There is nothing like the difference in the '94's and the Model 70's, obviously. The '94 design still has a number of parts which simply must be machined. I would agree that the quality of the walnut (which was always plain) might be a notch lower, machining tolerances are looser, and the wood-metal fit is done more quickly and without as much care. I doubt there is much difference in serviceablity. The current models, of course, have the abominable cross-bolt safeties and angle-ejections.