Actually, all T-5's in the Mustang 5.0 from 1985-1995 were of the World Class variety.
1983-1984 T-5's were rated at 265lb/ft, and had 2.95:1 first gear ratios.
1985 saw the T-5 drop back to 3.35:1 1st gear ratios and an a syncro upgrade kept it's rating of 265lb/ft intact. These were considered "World Class"
1990 was the next upgrade, to stronger gears themselves. The 3.35:1 1st gear stayed the same. Rating was now at 305lb/ft.
1993 saw the Cobra T-5 getting a tapered roller bearing to replace the weaker needle bearings on the input shaft, and it also got phosphate coated gears. Up to about 315lb/ft.
The T-5 Zspec is rated at 330lb/ft. It features a tapered roller bearing, steel input shaft bearing retainer, and a 2.95:1 1st gear ratio.
As far as the 3550HD, you'll also need an aftermarket shifter for it as the stock one sux ***. Be aware, if you break it, Tremec will undoubtedly deny warranty coverage if you use an aftermarket shifter. They just released a BS statement saying aftermarket shifters are causing the Tremec's to fail. The TKO is much stronger than the 3550, but expect to pay about $2000+ for the total conversion.
I've heard an AOD car's crossmember works for the Tremec.
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