Isuzu 5-speed - Revision history

Cliff: /* Fluid service */

2026-07-19T00:05:52Z

Fluid service

← Older revision		Revision as of 00:05, 19 July 2026
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	The Isuzu 5-speed requires the correct transmission fluid.		The Isuzu 5-speed requires the correct transmission fluid.

	~~For 1988 Fieros,~~ the ~~MT2~~ Isuzu 5-speed refill capacity ~~is listed~~ as:		Factory service information for the Fiero Isuzu 5-speed lists the MT2 refill capacity as:

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	Fluid level and condition are important for gear and bearing life. Low, contaminated, or incorrect fluid can contribute to noise, wear, and shifting problems.		Fluid level and condition are important for gear and bearing life. Low, contaminated, or incorrect fluid can contribute to noise, wear, and shifting problems.

	When servicing the transmission, verify the correct fluid specification for the model year and installed transmission.		When servicing the transmission, verify the correct fluid specification and capacity for the model year and installed transmission.

	Related topics:		Related topics:

2026-07-19T00:04:54Z

Naming

← Older revision		Revision as of 00:04, 19 July 2026
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	* Four-cylinder 5-speed		* Four-cylinder 5-speed

	~~Factory 1988~~ service information ~~identifies~~ the unit as the '''5-speed Isuzu 76 mm manual transaxle'''.		In factory service information, the unit may also be identified as the '''5-speed Isuzu 76 mm manual transaxle'''.

	In Fiero usage, “Isuzu 5-speed” usually refers to the five-speed manual transmission used behind the 2.5L four-cylinder engine.		In Fiero usage, “Isuzu 5-speed” usually refers to the five-speed manual transmission used behind the 2.5L four-cylinder engine.

2026-07-18T23:48:09Z

2026-07-18T23:46:33Z

2026-07-12T15:01:13Z

2026-07-12T15:01:00Z

Identification

← Older revision		Revision as of 15:01, 12 July 2026
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	== Identification ==		== Identification ==

	The Isuzu 5-speed can be identified by transmission case features, shift cable arrangement, model year, engine application, and related mounting hardware.		The Isuzu 5-speed can be identified by transmission case features, shift cable arrangement, model year, engine application, RPO code, and related mounting hardware.

			Useful identification checks include:

			* RPO code '''MT2'''
			* Four-cylinder factory application
			* Five-speed shift pattern
			* Isuzu-specific shift cable arrangement
			* Transmission case features
			* Mounting brackets
			* Service parts identification label, if still present
			* Physical inspection of the installed transmission

	Because many Fieros have been modified, repaired, or swapped over time, identification should be based on the actual installed transmission rather than the car's year or trim alone.		Because many Fieros have been modified, repaired, or swapped over time, identification should be based on the actual installed transmission rather than the car's year or trim alone.

2026-07-12T15:00:43Z

Relationship to the Getrag 5-speed

← Older revision		Revision as of 15:00, 12 July 2026
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	== Relationship to the Getrag 5-speed ==		== Relationship to the Getrag 5-speed ==

	The Isuzu 5-speed and [[Getrag 5-speed]] are both five-speed manual transmissions ~~used in the Fiero~~, but they were used in different factory applications.		The Isuzu 5-speed and [[Getrag 5-speed]] are both factory Fiero five-speed manual transmissions, but they were used in different factory applications.

	The Isuzu 5-speed was used with the 2.5L four-cylinder engine.		The Isuzu 5-speed was used with the 2.5L four-cylinder engine from 1985 through 1988.

	The Getrag 5-speed was used with the 2.8L V6.		The Getrag 5-speed was used with the 2.8L V6 in later V6 Fieros.

	Because both are five-speed manuals, the two are sometimes confused in owner discussions. Parts, cables, brackets, mounts, internal components, and service procedures should not be assumed to interchange without verification.		Because both are five-speed manuals, the two are sometimes confused in owner discussions. Parts, cables, brackets, mounts, internal components, and service procedures should not be assumed to interchange without verification.

2026-07-12T15:00:00Z

← Older revision		Revision as of 15:00, 12 July 2026
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	The Isuzu 5-speed was the factory five-speed manual transmission for four-cylinder Fieros. Gear ratios, codes, and service details should still be verified against the actual installed transmission when exact information matters.		The Isuzu 5-speed was the factory five-speed manual transmission for four-cylinder Fieros. Gear ratios, codes, and service details should still be verified against the actual installed transmission when exact information matters.

			== Gear ratios ==

			The Fiero four-cylinder Isuzu 5-speed is associated with RPO code '''MT2'''.

			{\| class="wikitable"
			! Gear
			! Ratio
			\|-
			\| 1st
			\| 3.73
			\|-
			\| 2nd
			\| 2.04
			\|-
			\| 3rd
			\| 1.45
			\|-
			\| 4th
			\| 1.03
			\|-
			\| 5th
			\| 0.74
			\|-
			\| Final drive
			\| 3.35
			\|}

			The fifth gear is an overdrive gear and helps reduce engine rpm during highway driving.

			Because Fieros are often modified, repaired, or transmission-swapped, the actual installed transmission should be identified directly when exact gearing matters.

	== Operation ==		== Operation ==

2026-07-12T14:59:24Z

Specifications

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	\| Type		\| Type
	\| Transverse manual transaxle		\| Transverse manual transaxle
			\|-
			\| RPO code
			\| MT2
	\|-		\|-
	\| Speeds		\| Speeds
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	\|-		\|-
	\| Factory Fiero use		\| Factory Fiero use
	\| 2.5L four-cylinder models		\| 1985-1988 2.5L four-cylinder models
	\|-		\|-
	\| Factory V6 use		\| Factory V6 use
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	\|}		\|}

	~~Exact gear~~ ratios, codes, and ~~year-to-year~~ details should be verified against the ~~correct model-year factory service~~ information.		The Isuzu 5-speed was the factory five-speed manual transmission for four-cylinder Fieros. Gear ratios, codes, and service details should still be verified against the actual installed transmission when exact information matters.

	== Operation ==		== Operation ==

2026-07-12T14:59:14Z

Fiero applications

← Older revision		Revision as of 14:59, 12 July 2026
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	== Fiero applications ==		== Fiero applications ==

	The Isuzu 5-speed was used with the 2.5L four-cylinder Fiero.		The Isuzu 5-speed was used with the 2.5L four-cylinder Fiero from 1985 through 1988.

			It replaced the 1984 four-cylinder Muncie 4-speed manual transmissions as the factory manual transmission for four-cylinder Fieros.

	It was not the factory V6 five-speed transmission. V6 five-speed Fieros used the [[Getrag 5-speed]].		It was not the factory V6 five-speed transmission. V6 five-speed Fieros used the [[Getrag 5-speed]].

			Common factory applications include:

			* 1985 four-cylinder Fieros
			* 1986 four-cylinder Fieros
			* 1987 four-cylinder Fieros
			* 1988 four-cylinder Fieros

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