Yes, the 3 speed first appeared in 63 with the 64 and earlier bellhousing bolt pattern. It was Ford's first syncroed in low gear 3 speed. It is what the 4 speed top loader was based on. (T-10's of the day wouldn't hold up to the big blocks too well) In 65 Ford changed the bolt pattern for the bellhousing to what has been used since that time.

Interestingly enough you can find the Top Loader in late 60's GTO's with a 3 speed. Just a fun fact.