For 1990-2009 cars

Manual transmissions are identified by the number of forward gears and the measured distance between the centerline of the output shaft and the counter gear.

The 6-speed, 85 mm manual transmission (RPO MM6), used in the Camaro/Firebird, incorporates the following features:

• | An aluminum case.

• | Fully synchronized gearing with an enhanced synchronizer cone arrangement:

- | Triple-cone: FIRST, SECOND

- | Double-cone: THIRD, FOURTH, FIFTH, SIXTH

- | Single-cone: REVERSE

• | An internal shift rail mechanism.

• | Tapered roller bearings supporting the mainshaft and countershaft.

• | Caged roller bearings under all speed gears.

• | Solenoid inhibit of SECOND and THIRD gears.

• | Solenoid inhibit of REVERSE gear during predefined forward motion.

#### Gear Select (Skip Shift)

To ensure good fuel economy and compliance with federal fuel economy standards, SECOND and THIRD gears are inhibited when shifting out of FIRST gear under the following conditions:

1. Coolant temperature is above 50°C (122°F).
2. Vehicle speed is between 20 and 29 km/h (12 and 19 mph)
3. Throttle is opened 35 percent or less.

#### Reverse Lockout

A reverse lockout system (consisting of a reverse lockout solenoid which operates a reverse lockout mechanism) is utilized to prevent shifting into REVERSE gear when the vehicle is moving forward at a speed of 5 km/h (3mph) or more.

#### Vehicle Speed Sensor

The vehicle speed sensor (VSS) is a pulse counter type input that informs the PCM how fast the vehicle is traveling. The VSS system uses an inductive sensor mounted in the tail housing of the transmission and a toothed reluctor wheel on the tail shaft. The teeth of the reluctor wheel alternately interfere with the magnetic field of the sensor creating an induced voltage pulse as the reluctor rotates.