Take some pictures of your tranny from under the car and then go to where the tranny is being sold and see if things look the same. Should be, but 96 was the first year for the Muatang using the 4.6 and the 4r70w and I have no clue what the first year of the T-bird was so there may be something like the speedo, or main harness not being pinned the same,etc,etc. You know the tranny will physically bolt in and that your drive shaft will fit so try using the Internet to find the wiring diagrams for each car and find out how the speedo works. I would imagin the gear selector should work or you should be able to bolt up the Mustang stuff.