KM164 - Revision history

Cartman02au at 00:59, 4 January 2026

2026-01-04T00:59:09Z

← Older revision		Revision as of 00:59, 4 January 2026
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	[[Category: First Generation Magna]]		[[Category: First Generation Magna]]
	[[Category: Manual Transaxles]]		[[Category: Manual Transaxles]]
	[[Category: Revised]]		[[Category: Mitsipedia/Revised]]

Cartman02au at 00:24, 4 January 2026

2026-01-04T00:24:44Z

← Older revision		Revision as of 00:24, 4 January 2026
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	[[Category: First Generation Magna]]		[[Category: First Generation Magna]]
	[[Category: Manual Transaxles]]		[[Category: Manual Transaxles]]
			[[Category: Revised]]

Cartman02au at 00:16, 4 January 2026

2026-01-04T00:16:36Z

← Older revision		Revision as of 00:16, 4 January 2026
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	The '''KM164''' is an 5 speed manual transaxle ~~which was fitted to~~ [[TM]] ~~model Magnas~~.		The '''KM164''' is a 5-speed manual transaxle primarily known for its application in the [[First Generation Magna#TM\|TM Magna]] (produced between 1985 and 1987). While it functioned as a standard 5-speed gearbox for the driver, its internal engineering was a unique departure from traditional transmission design.

	The KM164 ~~is interesting as it uses~~ a ~~vacuum servo to select what is seen by~~ the driver ~~as 5th gear, which is achieved by changing~~ a ~~gear on the input shaft. When 5th gear is activated - the transmission remains in 4th gear~~ and the ~~high ratio on the input shaft is selected. Essentially the transmission in the transaxle is a high/low ratio unit, however~~ this ~~is only ever used when~~ the ~~vehicle is put in and out of 5th~~ gear ~~unlike some other vehicles~~.		The KM164 was a derivative of Mitsubishi’s earlier "Super Shift" or "Twin Stick" technology. While those older transmissions gave the driver a separate lever to choose between Power and Economy ranges across all gears, the KM164 automated this process specifically for the final gear.

	~~The~~ KM164 ~~was superseeded by~~ the ~~[[KM210]]~~ in ~~[[TN]] and [[TP]] models~~.		Mechanically, the main gearbox is a 4-speed unit but instead of a traditional 5th gear synchronization on the main shaft, the KM164 utilizes a vacuum-actuated servo. When the driver moves the gear lever into the 5th gear position, a switch triggers the vacuum servo. This servo shifts a separate "high/low" gear set on the input shaft. The transmission remains physically in the 4th gear gate, but the input ratio is increased to a higher "overdrive" ratio. To the driver, this feels like a standard shift into 5th, but internally, the entire input speed to the gearbox has been altered.

			This design allowed Mitsubishi to provide a 5-speed experience using a modified 4-speed architecture, saving on the cost of a total redesign during the TM Magna's development. However, the reliance on vacuum lines and servos introduced specific points of failure:
			*'''Vacuum Leaks:''' If a vacuum hose perished or the servo diaphragm failed, the car would often lose the ability to engage 5th gear entirely.
			*'''Shift Lag:''' Because the shift relied on engine vacuum rather than a direct mechanical link, the engagement of 5th gear could sometimes feel slightly delayed compared to the crisp mechanical engagement of gears 1 through 4.

			As Mitsubishi refined the Magna platform for the [[TN]] (1987) series, the KM164 was phased out and superseded by the [[KM210]] transaxle.
	==Technical data==		==Technical data==
	{\|cellpadding="3" align="left"		{\|cellpadding="3" align="left"

Cartman02au at 01:24, 11 January 2010

2010-01-11T01:24:24Z

← Older revision		Revision as of 01:24, 11 January 2010
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	\|4.109		\|4.109
	\|}		\|}
	[[Category: ~~First_Generation~~]]		[[Category: First Generation Magna]]
	[[Category: Manual Transaxles]]		[[Category: Manual Transaxles]]

Administrator: Protected "KM164" [edit=sysop:move=sysop]

2008-01-18T11:21:27Z

Protected "KM164" [edit=sysop:move=sysop]

New page

The '''KM164''' is an 5 speed manual transaxle which was fitted to [[TM]] model Magnas.

The KM164 is interesting as it uses a vacuum servo to select what is seen by the driver as 5th gear, which is achieved by changing a gear on the input shaft. When 5th gear is activated - the transmission remains in 4th gear and the high ratio on the input shaft is selected. Essentially the transmission in the transaxle is a high/low ratio unit, however this is only ever used when the vehicle is put in and out of 5th gear unlike some other vehicles.

The KM164 was superseeded by the [[KM210]] in [[TN]] and [[TP]] models.

==Technical data==
{|cellpadding="3" align="left"
|'''Lubricant'''
|75W/85W Hypoid Gear Oil
|-
|'''Capacity'''
|2.3 Litres
|-
|'''Clutch Plate Diameter'''
|215 mm
|-
|'''Clutch Operation'''
|Hydraulic
|
|-colspan="2"
|'''GEAR RATIOS'''
|-
|'''Final Drive'''
|3.187
|-style="align: left"
|'''1st'''
|4.070
|-
|'''2nd'''
|2.244
|-
|'''3rd'''
|1.467
|-
|'''4th'''
|1.105
|-
|'''5th'''
|0.855
|-
|'''Reverse'''
|4.109
|}
[[Category: First_Generation]]
[[Category: Manual Transaxles]]