ShawnQ,
The 7/70 powertrain warranty can only be transferred (for a fee) from the original owner to a second owner. It is not valid for third or subsequent owners.
However, the original 3/36 warranty should still be in effect provided the mileage is still within the limits.
Check out this link:
http://www.chrysler.com/owners/index.html
Click "warranty" to get the details for the Crossfire.