Manual Transmission Description and Operation (MM6): Notes
WARNING: This page is about a different variant/trim than selected.
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: MM6 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, REVERSE
- An internal shift rail mechanism
- A remote transmission shift control mounted forward of the transmission
- An external transmission shift rod enabling the rearward mount location of the transmission shift control
- 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 678 N.m (500 lb ft) for RPO: MM6.
The gear ratios are as follows:
| Gear | MM6 Ratio (:1) |
|---|---|
| FIRST | 2.66 |
| SECOND | 1.78 |
| THIRD | 1.30 |
| FOURTH | 1.00 |
| FIFTH | 0.74 |
| SIXTH | 0.50 |
| REVERSE | 2.90 |