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1993 Ford SVT Cobra T5 Transmission First Gear

Notice the wider and thicker teeth of the A-5 First gear (left) vs. the factory/OEM First M/S gear (right). Astro claims that the A-5 First gear is the strongest synchronized First mainshaft gear on the market. It also converts the factory First-gear ratio to a 2.95 from a 3.35:1.
Astro Performance T5 Manual Transmission - Standard Shifting Procedures

Notice the wider and thicker teeth of the A-5 First gear (left) vs. the factory/OEM First M/S gear (right). Astro claims that the A-5 First gear is the strongest synchronized First mainshaft gear on the market. It also converts the factory First-gear ratio to a 2.95 from a 3.35:1.  View Related Article