Red gear (manual trans) is 21T. If that was very close to accurate with 4.10 and an 8T AOD (late '89-'93), the tires must have been huge....enough to bring the final drive ratio way back down.
Drive Gear x Rear Gear x Tire RPM / 1000 = Driven Gear
Drive Gears
6T = Black = E3ZZ-17285-B (T-5 only)
7T = Yellow = E3ZZ-17285-A (T-5 only)
8T = Green = F0ZZ-17285-A (T-5 only)
Driven Gears
16T = Wine = C0DZ-17271-A (T-5) or Blue = D0AZ-17271-A (AOD) (discontinued)
17T = White = C3DZ-17271-C (T-5) or Green = C7SZ-17271-A (AOD)
18T = Yellow = C0DD-17271-B (T-5) or Gray = C7SZ-17271-B (AOD) (discontinued)
19T = Pink = CODZ-17271-B (T-5) or Tan = C7VY-17271-A (AOD)
20T = Black = C1DZ-17271-A (T-5) or Orange = C8SZ-17271-B (AOD)
21T = Red = C4OZ-17271-A (T-5) or Purple = D0OZ-17271-B (AOD)
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