Manual Transmission: Notes
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The S6-650 and the M6HD transmissions are 6-speed synchronized units. The ZF 6-speed has the following features:
- An integral clutch housing
- An aluminum main case, extension housing and intermediate housing
- The mainshaft has 2 tapered roller bearings. Mainshaft end play is controlled by a selective shim located under the bearing cup
- The countershaft has 2 tapered roller bearings. The countershaft end play is controlled by a selective shim located under the bearing cup
- The countershaft is serviced as an assembly
- Synchronized in all gears
- All gears are helical
- All gears, including reverse, turn on needle roller bearings
- Single-piece shift forks with moly-coated pads
- Internal oil pump, driven by the countershaft, to supply transmission fluid to an external cooler
- Provisions for mounting a power take-off unit
- A reverse idler gear that does not need to be removed during disassembly
- The mainshaft and countershaft are assembled under preload. If the ZF transmission is disassembled, a preload measurement must be taken
The S6-650 and the M6HD have 6 forward speeds that feature a LOW gear for take-off under heavy loads and a OVERDRIVE gear for highway driving conditions. The gear ratios are as follows:
- Low 5.79:1
- 1st 3.30:1
- 2nd 2.10:1
- 3rd 1.31:1
- 4th 1.00:1
- Overdrive or 5th 0.72:1
- Reverse 5.23:1