Manual Transmission Description and Operation: Notes

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 manual transmission (RPO M12), used in CTSV, 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
• A remote transmission shift control mounted forward of the transmission
• An external transmission shift rod enabling the forward mount location of the transmission shift control
• An extended-length transmission output shaft mating directly to the rear axle drive pinion, in the rear of the differential housing
• 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

These features combine to yield a rugged, reliable system capable of handling input torques of up to 540 N.m (400 lb ft).

The gear ratios are as follows: