Manual Transaxle
Manual Transaxle
The G5M 5-speed manual transaxle features the following:
- Fully synchronized 5-speed transaxle
- Synchronized reverse gear
- A shift interlock system prevents the engagement of more than one gear
- An aluminum main case and bellhousing
The function of the transmission is to move the vehicle from a rest position to motion. This is done by transferring the engine torque, through the transaxle, to the front wheels. The forward gears are selected by a synchronizer mechanism. The 3rd gear, 4th gear and the 5th speed cluster gear are mounted on the input shaft. The 1st gear, 2nd gear and the reverse output gear are mounted on the output shaft. The helical-cut forward gears are in constant mesh with the corresponding gears on the opposing shaft. Reverse gears have helical-cut teeth and are engaged through the reverse idler gear.
Power Flow
External Shift Linkage
The manual transaxle is controlled by a floor-mounted gearshift lever located in the floor console. Connection between the floor-mounted gear shift lever and the manual transaxle gear shift control mechanism is made through 2 shift cables.
Internal Shift Linkage
The G5M manual transaxle is shifted internally by 3 shift forks. The 5th and reverse gear shifter fork shifts in and out of the 5th and reverse gears. The 1st/2nd and the 3rd/4th shift forks control all other forward gear shifts.
Reverse Gear
The reverse idler gear and bushing is mounted on a reverse idler gear shaft supported at one end in the flywheel housing and at the other in the transaxle case. Because the reverse idler gear and bushing slides and rotates on the reverse idler gear shaft, the bushing is necessary to prevent metal-to-metal contact and wear.
When the reverse idler gear and bushing slides on the reverse idler gear shaft, it engages the reverse drive gear on the input shaft and the reverse gear on the output shaft. The driving gear is part of the input shaft and the reverse gear is machined on the outside diameter of the 1st/2nd synchronizer sleeve.
When the reverse idler gear and bushing rotates on the reverse idler gear shaft, it reverses the power flow to the output shaft.
To engage the reverse idler gear and bushing, the motion of the shift fork selector lever is transferred to the reverse gearshift lever through the shift gate. The reverse gearshift lever is mounted on a meshlock plunger that allows it to act as a fulcrum. When the reverse/5th gearshift selector arm moves its end of the shift fork selector lever, the opposite end slides the reverse idler gear and bushing into engagement with the input shaft and output shaft reverse gears.
Differential
The ends of the differential are supported on tapered roller differential bearings. The cups for these differential bearings are seated in the transaxle case and the flywheel housing. Differential bearing preload is set using a selective differential bearing shim that is installed under the differential bearing cup in the transaxle case.
The differential includes the differential side gears and the shaft mounted differential pinion gears. Direct contact between the gears and the differential case is prevented by the differential side gear thrust washers installed under the gears. The differential pinion shaft is held in position by a differential pinion shaft lock pin that extends through the end of the differential pinion shaft and the differential case.
The speedometer drive gear is also mounted on the differential case. It is located between the tapered roller differential bearing and the differential case. A tab on the speedometer drive gear and a matching slot in the differential case prevent the speedometer drive gear from spinning on the differential case.