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With the stock transmission removed, we were able to determine that it had serious internal problems. Not only did the 10-spline input shaft have excessive back-and-forth movement, it also was loose enough to touch the bearing retainer. Something to keep in mind is the fact that OEM T-5s installed in ’86-’89 5.0 Mustangs are rated at 265 lb-ft of torque, which was more than adequate for bone-stock Ponies. Greg’s transmission has endured power shifts influenced by nitrous and a supercharger, so it’s safe to assume the Pony’s torque levels have been beyond the maximum rating for a while..