All Things Fiero > Expert Tech Advice

Transmission Identification

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Fierofool:
Reproduced from a post by RobsFieros

"TRANSMISSION IDENTIFICATION
ASSEMBLY CODE TO TRANSMISSION

1984
NA-MY8
PF-MD9
UM-M19

1985
CD-MD9
PF-MD9
UA-MY7
5ZH-MT2

1986
5UA-M17
6CD-MD9
6PF-MD9

1987
7CPC-MD9
7PSC-MD9
5ZH-MT2
ZNH-MG2

1988
8CPC-MD9
8PSC-MD9
8ZL-MG2"

MY8 is 3.32
MD9 is the auto
M19 is 4.10

As a footnote, in the event the transmission is still in the car or the ID tag is missing, you can identify transmissions by these methods.  However, you cannot visually distinguish between the 4:10 and 3:32 ratio 4 speeds.

All 84 manual transmissions were 4 speeds.  They all had cable mounts cast onto the case.  This is due to the fact that the transmissions were left-over transmissions used in the Front Wheel Drive Citations.  Those mounts aren't used in the Fiero.  A separate bolt-on mount is used.  The case is smooth around the axle seals.  It is a two piece case

The 85 and 86 4 speeds do not have cable mounts cast onto the case.  There is reinforcement ribbing radiating outward from the axle seals.  It is a three piece case.

All 4 speeds have the cables running low to the transmission and they run parallel to one another. 
4 speed cables from an 84 are slightly shorter than the cables from the 85 and 86 V6 cars and may create some difficulty if used on a V6 equipped vehicle.

All 85 and later 4 cylinder manuals were 5 speed Isuzu transmissions.  They had long cables running parallel to one another and were routed up and over the engine.  The transmission has a bolt on cable mount with a yoke that captures the cables to the mount.  Transmission shift linkage is stamped metal.

The Getrag transmission has a metal end plate.  Transmission cables are routed with one coming up from below and one coming at a downward angle from near the slave cylinder.

Isuzu and Getrag shifters are interchangeable among 5 speed cars.
All pressure plate/clutch disks can be interchanged but the smaller 4 cylinder assemblies installed on a V6 may show premature failure since the friction surface is much smaller.

The Muncie 4-speeds, the Isuzu 5-speeds and the Getrag 5-speeds each use a transmission-specific release bearing which is not interchangeable to other Fiero transmissions.

All manual transmission axles are interchangeable among manual equipped Fieros.

GTRS Fiero:
Apparently, that was a quote from the manual.

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