Suspension RPO codes
Suspension RPO codes are RPO codes used to identify factory suspension packages, spring codes, and related suspension equipment on the Pontiac Fiero.
For a complete searchable list of Fiero RPO and option codes, see:
Overview
Suspension RPO codes help identify suspension-related equipment originally assigned to a Fiero.
These codes may appear on the Service parts identification label along with engine, transmission, paint, trim, wheel, tire, audio, and other factory build codes.
The RPO code identifies original factory equipment. It does not necessarily prove which springs, shocks, struts, control arms, cradle, or suspension parts are currently installed, because many Fieros have been repaired, modified, lowered, upgraded, or parts-swapped.
Related topics:
Suspension package codes
| Code | Description | Category | Notes |
|---|---|---|---|
| F41 | Heavy-duty front and rear suspension | Suspension | Special suspension equipment |
| WS6 | Special performance package | Suspension / package | Commonly associated with performance suspension equipment |
| Y99 | Special Rally suspension package | Suspension / package | Listed for 1985-1986 in some references |
F41
F41 identifies heavy-duty front and rear suspension equipment.
The exact parts and relationship to other suspension packages should be verified by model year and application.
Related topics:
WS6
WS6 identifies the special performance package.
In Fiero usage, WS6 is commonly discussed as a performance suspension-related package. Depending on year and model, it may be associated with handling-oriented equipment rather than a single suspension part.
Because package contents can vary by year and model, WS6 should be interpreted using the car's model year, trim level, wheel and tire equipment, and other RPO codes.
Related topics:
Y99
Y99 identifies a Special Rally suspension package in some Fiero references.
Its exact use should be verified by model year and application.
Related topics:
Spring codes
Spring codes are commonly listed as 6xx, 7xx, 8xx, and 9xx codes.
In general:
| Code pattern | Position |
|---|---|
| 6xx | Left front spring |
| 7xx | Right front spring |
| 8xx | Left rear spring |
| 9xx | Right rear spring |
The actual spring code uses a number followed by two letters.
Examples include:
| Code | Description | Category | Notes |
|---|---|---|---|
| 6HY | Left front spring | Suspension / springs | Listed for 1985-1987 in some references |
| 7HZ | Right front spring | Suspension / springs | Listed for 1985-1987 in some references |
| 8WY | Left rear spring | Suspension / springs | Listed for 1984-1987 in some references |
| 9WY | Right rear spring | Suspension / springs | Listed for 1984-1987 in some references |
Spring codes are highly application-specific. They may vary by model year, engine, transmission, suspension package, air conditioning, body style, or other build factors.
When replacing springs, do not assume that a spring from another Fiero is identical just because it physically fits.
1988 suspension relationship
The 1988 suspension is different from the 1984-1987 suspension.
This is important when interpreting suspension-related codes, spring codes, parts compatibility, and service information.
A suspension code may identify factory build information, but the actual installed suspension should still be inspected directly, especially on cars that may have had cradle swaps, suspension swaps, lowering springs, aftermarket shocks/struts, or accident repairs.
Related topic:
Tire and wheel relationship
Suspension packages may be related to wheel and tire equipment.
For example, handling-oriented packages may appear together with specific wheel and tire codes. However, a wheel code, tire code, and suspension code are not the same thing.
Related topics:
Suspension code versus installed parts
The suspension RPO code identifies how the car was originally built.
It does not prove that the current suspension is original.
Many Fieros have had suspension changes such as:
- Replacement springs
- Lowering springs
- Aftermarket shocks or struts
- Polyurethane bushings
- Ball joint replacement
- Tie-rod replacement
- Control-arm replacement
- Cradle replacement
- 1988 cradle or suspension swaps
- Brake upgrades
- Wheel and tire changes
- Accident repair
When documenting a car or ordering suspension parts, compare the Service Parts Identification label with physical inspection of the actual installed parts.
Model-year differences
Suspension hardware and tuning changed during Fiero production, with the largest factory change occurring for the 1988 model year.
When interpreting suspension RPO codes, verify:
- Model year
- Suspension package code
- Spring codes
- Engine
- Transmission
- Wheel and tire codes
- Body style and trim level
- Current installed parts
- Previous repair or modification history
Common mistakes
Common mistakes when using suspension RPO codes include:
- Assuming the current suspension is original
- Ignoring 1988-specific suspension differences
- Confusing suspension package codes with spring codes
- Confusing wheel or tire codes with suspension codes
- Assuming every WS6 car has identical parts across all years
- Ordering suspension parts based only on RPO code
- Ignoring lowering springs or aftermarket parts
- Assuming a swapped cradle matches the car's original RPO label
Service notes
When using suspension RPO codes:
- Photograph the Service Parts Identification label before it fades further.
- Record suspension and spring codes exactly.
- Verify model-year applicability.
- Inspect the actual installed suspension.
- Check whether the car has been lowered or modified.
- Check for 1988-specific suspension parts where applicable.
- Verify spring codes carefully before replacing springs.
- Use physical inspection when ordering parts for modified or repaired cars.
Notes
Suspension RPO codes are factory build references. They help identify how a Fiero was originally equipped, but they do not necessarily describe the suspension currently installed.
Because Fiero suspension parts are often replaced, upgraded, or swapped, physical inspection is important when ordering parts or documenting originality.