I was at T2 and transferred to T25 specifically to try to get a job in that market. It worked, but it was very hard and took a long time to get an offer. In my experience (including anecdotal info from others), transfers don't do as well in fall recruiting as returning students--no journal or moot court/mock trial, and no grades at your new school.
At the same time, your chances of getting biglaw job in Cali from T2 in NY are very, very slim. If you are really committed to working in CA, you should transfer. If you have the grades, go to any T14 (or probably even T25) and you will be much better off, even if the school isn't in CA. If not, then try for the highest ranked school in CA.
FYI: With transfer apps, the earlier the better and volume helps--it's a somewhat random process.