All T-5's in Mustang GT's after 1984 are "world class."
Your stock tranny is rated for 305lb/ft or torqueload. With the 3.35:1 1st gear, they don't get much stronger.
The Z spec T-5 obtains most of it's 330lb/ft rating from the 2.95:1 first gear ratio it uses. The other portion is from the tapered roller bearing. If you go with 3.73's, it may be worth it to get the taller 2.95:1 1st gear ratio so 1st gear becomes a little more useable. D&D Performance sells the Z spec for $1049 right now. Good deal on a very nice tranny. I have one. Just like 1BAD89, my tranny is great.
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