The number is the highest gear that the transmission will use.

In D, the car will use 1, 2, 3, or 4.

In 3, the car will use 1, 2, or 3.

In 2, the car will use 1 or 2.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record