Trust me, you have a T45 made by Borg Warner. The 99-up stangs have a Tremec T45 up untill I think 01 and then it's a Tremec 3560 5-speed. They didn't change to a Tremec brand untill after 99. The Tremec T5 was in the 95-earlier stangs.
The Steeda is an excellent choice. Also go with the 3.73s with your daily driver. I think you'll probably like those best. That's what's recommended for the 4.6 5speed daily driver. Though 4.10s probably wouldn't be a bad choice either if you aren't too particular about gas mileage. Your stock gearing is a 2.73. You can look on the rear of the differential. There's a metal tag on there that'll tell you. I don't remember if it's the top or bottom line but it'll say 2L73 on it. The L means you have the traction lock rear and the 2 73 is the gear ratio. If it had something different it would be like 2 73, 3L08, 3 08, 3L27, 3 27. Standard gearing was a 2.73. Looks like you're on the right track. The Modular Madness forum on here is specifically for the 4.6 motors. You should definitely hang out there for a ton of info. Have fun.
