Parts Interchange Manual

[GTRS Fiero]

WHEEL CENTER CAPS
Most Fiero wheels have a plastic cap in the center of the wheel. Some '86-87 models have a Fiero emblem on the cap. The '84, '85 and '88s are blank. Identical blank caps can be found on late '80s Pontiacs. The Fiero logo decal can be added to the blank caps if desired. Blank caps are still available from GM but of course they are pricey. (Center cap decals available at fierosails.com.)

[GTRS Fiero]

WINDOWS
Power window motors in the Fiero are the same from like years of Firebirds and Camaros and many GM cars of the late '80s and early '90s. Finding good motors in salvage yard should be easy. Motors are still available from GM but are pricey. Salvaged motors from the rear doors in 4-door GM cars are generally in excellent condition.

Power window and power mirror switches are exactly the same in some years of Firebirds and Camaros. Since all these electrical items are the same, so are the connectors.

Manually powered window cranks, called "regulators", can be purchased new from auto parts stores carrying the Help! brand of small parts and accessories. The regulator for all Fieros is Help! 76903.

[GTRS Fiero]

WING (SPOILER)
The "wing" or spoiler on the Fiero is unique and was not used on any other vehicle. New replacements are available from JC Whitney and the Fiero Store. Used Fiero spoilers appear frequently on eBay. Spoilers from other vehicles can be made to fit the Fiero and some will have a brake light installed in them, such as those from the '86 Firebird.

The Formula and Indy were the only models that had a wing as standard equipment. (Actually Formula and Indy were an option group on a coupe; the wing was standard equipment within that option group.) Wings were optional on GTs and SEs. The wing in 1988 was slightly different on the underside than in 1984-87, but all factory wings interchange.

Fiero wings used to be a highly desired theft target and many that were stolen were replaced with aftermarket units. Used wings were very scarce and although the original production option price was under $300, Pontiac had replacements priced at nearly $1000.

All factory wings had two separate stands (called stantions) that screwed to the underside of the wing. The stantions and the gaskets which mount between the stantion and deck lid are different depending on the year and model as follows:

- The '84 Indy and '85 GT have the same stantions. The stantions mount to the deck lid with studs which thread into the base of the stantion. For '84-85, the stantion had a narrow fixed "spread" between studs. This stud spacing will not fit existing deck lid holes in '86-88 deck lids. However you can drill different holes to make them fit or you can get a "clean" deck lid and drill new holes.

- The '86-88 wings came with stantions with dual locations for the studs so the stantions will work with all years.

- The stantion gasket on the notchback body style (any Fiero other than '86-88 GTs) is identical for left and right sides and can be used on either stantion. The fastback gasket is not identical and there is a left and right. The difference is slight and you can force-fit an "incorrect" gasket with a bit of heat from a heat gun (used moderately). The difference in the GT gaskets is most easily discerned by the taper in the edge where the gasket meets the character line in the fastback decklid.

(Our thanks to Ed Parks and Mark Corbin for the above info.)

We understand but cannot confirm that wings from other vehicles will work on the Fiero and provide a "look" that you may find more appealing than the stock version. Vehicles which have wings known to work include the following:

Plymouth Duster
Plymoutn Sundance
Pontiac Firebird
Z34 (requires grinding the stantions)
We apologize that we do not know which years to look for on the above cars.

[GTRS Fiero]

WIPER MOTOR
Wiper motors in the Fiero differed depending on the "intermittent" or "pulse" action.

'84:   Accoring to the Hollander manual, the'84 Fiero did not have a pulse wiper. However Jim Teague, the original owner of an unmodified '84 Fiero, advises that his car has an intermittent wiper motor. So it appears at least some '84 Fieros came from the factory with the upgraded motors. In any case, the cars below had wiper motors which can swap with the '84 Fiero:

Blazer/S10/GM Jimmy S15   '83-84
Blazer/S10/GM Jimmy S15   '83-93  without pulse wiper
Buick Skyhawk             '82-83
Buick Skyhawk             '84-89  without pulse wiper
Cadillac Cimarron         '82-83
Chevy Cavalier            '82-83
Chevy Cavalier            '82-94  without pulse wiper
Olds Firenza              '82-83
Olds Firenza              '84-88  without pulse wiper
Pontiac 2000              '82-83
Pontiac 2000                 '84  without pulse wiper
Pontiac Astro             '85-89  without pulse wiper
Pontiac Safari (GMC)      '85-89  without pulse wiper
Pontiac Sunbird          ' 85-94  without pulse wiper
S10/S15/GM Sonoma         '82-84
S10/S15/GM Sonoma         '85-93  without pulse wiper
'85-88: with pulse wiper. Those without pulse wiper had the same motor as '84.
Buick Skyhawk             '84-89  with pulse wiper
Cadillac Cimarron         '84-88
Blazer S10/GM Jimmy S15   '85-93  with pulse wiper
Blazer S10/GM Jimmy S15      '94
Chevy Cavalier            '84-94  with pulse wiper
GM Syclone                   '91
GM Typhoon                '92-93
Olds Bravada              '91-94
Olds Firenza              '84-88  with pulse wiper
Pontiac 2000                 '84  with pulse wiper
Pontiac Astro             '85-89  with pulse wiper
Pontiac Astro             '90-93
Pontiac Safari (GMC)      '85-89  with pulse wiper
Pontiac Safari (GMC)      '90-93
Pontiac Sunbird           '85-94  with pulse wiper
S10/S15/GM Sonoma         '85-93  with pulse wiper
'84-88: If you transfer the wiper circuit board in your Fiero to another motor, you can use wiper motors from any of the cars below in a Fiero:
Buick Skyhawk 1.8L             '84-86
Buick Skyhawk 2.0L             '84-89
Cadillac Cimarron 2.0L         '84-86
Cadillac Cimarron 2.8L         '85-87
Chevrolet Astro Truck 2.5L     '85-90
Chevrolet Atro Truck 4.3L      '85-93
Chevrolet Cavalier 2.0L        '84-89
Chevrolet Cavalier 2.2L/3.1L   '90-94
Chevrolet Cavalier 2.8L        '85-89
Chevrolet S10 2.5L/2.8L        '85-93
Chevrolet S10 4.3L             '88-94
Chevrolet S10 Blazer 1.9L      '84-85
Chevrolet S10 Blazer 2.5L      '85-88
Chevrolet S10 Blazer 2.8L      '85-90
Chevrolet S10 Blazer 4.3L      '88-93
GMC S15 1.9L/2.2L              '85
GMC S15 2.5L/2.8L              '85-90
GMC S15 4.3L                   '88-90
GMC S15 Jimmy 2.5L             '85-88
GMC S15 Jimmy 2.8L             '85-89
GMC S15 Jimmy 4.3L             '88-93
GMC S15 Sonoma                 '94
GMC S15 Sonoma 2.5L2.8L/4.3L   '91-93
GMC S15 Syclone 4.3L           '91
GMC S15 Typhoon 4.3L           '92-93
GMC Safari                     '93
GMC Safari 2.5L                '85-90
GMC Safari 4.3L                '85-92
Oldsmobile Bravada 4.3L        '91-94
Oldsmobile Firenza 1.8L        '84-86
Oldsmobile Firenza 2.0L        '84-88
Oldsmobile Firenza 2.8L        '85-87
Pontiac J2000 1.8L/2.0L        '84
Pontiac Sunbird 1.8L           '86
Pontiac Sunbird 2.0L           '85-94
Pontiac Sunbird 3.1L           '91-94

[GTRS Fiero]

TRANSMISSION, AUTOMATIC
The Fiero automatic transmission is GM's TH-125C three-speed. Some variations exist depending on year and engine, so a swap with other Fieros should be done carefully.
'84: The cars below used TH-125 transmissions which will swap with the Fiero but they had transmission options other than automatic, so finding a transmission is not simply a matter of finding the correct vehicle.

   Buick Century            '82-83
   Buick Skylark               '82  2.5L lock-up converter
   Buick Skylark               '82  2.8L
   Buick Skylark            '83-84
   Chevy Celebrity          '82-84
   Chevy Citation              '82  2.5L lock-up converter
   Chevy Citation              '82  2.8L
   Chevy Citation           '83-84
   Olds Ciera               '82-84
   Olds Omega                  '82  2.5L lock-up converter
   Olds Omega                  '82  2.8L
   Olds Omega               '83-84
   Pontiac 6000             '82-84  gasoline engine
   Pontiac Phoenix             '82  2.5L lock-up converter
   Pontiac Phoenix             '82  2.8L
   Pontiac Phoenix          '83-84

TH-125 transmissions from the cars below can be used in the '84 Fiero if the neutral switch is removed.
   Buick Century            '85-88
   Buick Century               '89  2.5L
   Buick Century               '89  2.8L
   Buick Century            '90-92  2.5L
   Buick Century               '93  2.2L
   Buick Century            '94-95
   Buick Skylark               '85
   Chevy Celebrity          '85-89
   Chevy Citation              '85
   Chevy Lumina Van         '90-95
   Olds Cierra              '85-88
   Olds Cierra                 '89  2.5L
   Olds Cierra                 '89  2.8L
   Olds Cierra              '90-93  four cylinder
   Olds Cierra              '94-95
   Olds Silhouette          '90-94
   Pontiac 6000             '85-87
   Pontiac 6000             '88-89  front wheel drive
   Pontiac 6000                '90  2.5L front wheel drive
   Pontiac 6000                '91  2.5L
   Pontiac Trans Sport      '90-95

TH-125 transmissions from the cars below can be used in the '84 Fiero by switching the lock-up wiring and switches. Remove the neutral switch if needed.
   Buick Century         '84-85  diesel
   Buick Century         '89-93  3.3L
   Chevy Celebrity       '84-85  diesel
   Olds Ciera            '84-85  diesel
   Olds Ciera               '89  3.3L
   Olds Ciera            '90-93  six cylinder
   Pontiac 6000          '84-85  diesel
   Pontiac 6000             '90  3.1L  FWD
   Pontiac 6000             '91  3.1L

TH-125 transmissions from the cars below can be used in the '84 Fiero by transferring the lock-up wiring and switches.
   Buick Century        '82-83  diesel
   Chevy Celebrity      '82-83  diesel
   Olds Ciera           '82-83  diesel
   Pontiac 6000         '82-83  diesel



'85-87 TH-125 transmissions from the cars below can be used in the '85-87 Fiero.
   Buick Century               '85  gasoline
   Buick Century            '86-87
   Buick Skylark               '85
   Chevy Celebrity             '85  gasoline
   Chevy Celebrity          '86-87
   Chevy Citation              '85
   Olds Ciera                  '85  gasoline
   Olds Ciera               '86-87
   Pontiac 6000                '85  gasoline
   Pontiac 6000             '86-87

TH-125 transmissions from the cars below can be used in the '85-87 Fiero by changing the neutral switch as needed.

   Buick Century               '88
   Buick Century               '89  2.5L
   Buick Century               '89  2.8L
   Buick Century            '90-92  2.5L
   Buick Century               '93  2.2L
   Buick Century            '94-95
   Chevy Celebrity          '88-90
   Chevy Lumina Van         '90-95
   Olds Ciera                  '88
   Olds Ciera                  '89  2.5L
   Olds Ciera                  '89  2.8L
   Olds Ciera               '90-93  four cylinder
   Olds Ciera               '94-95
   Olds Silhouette          '90-94
   Pontiac 6000             '88-89   front wheel drive
   Pontiac 6000                '90  2.5L  front wheel drive
   Pontiac 6000                '91  2.5L
   Pontiac Trans Sport      '90-95

TH-125 transmissions from the cars below can be used in the '85-87 Fiero by switching the lock-up wiring and switches and by removing the neutral switch as needed.

   Buick Century            '82-85 diesel
   Buick Century            '89-93 3.3L
   Chevy Celebrity          '82-85 diesel
   Olds Ciera               '82-85 diesel
   Olds Ciera                  '89 3.3L
   Olds Ciera               '90-93 six cylinder
   Pontiac 6000             '82-85 diesel
   Pontiac 6000                '90 3.1L FWD
   Pontiac 6000                '91 3.1L

'88 TH-125 transmissions from the cars below can be used in the '88 Fiero.
   Buick Century               '88
   Buick Century               '89  2.5L
   Buick Century               '89  2.8L
   Buick Century            '90-92  2.5L
   Buick Century               '93  2.2L
   Buick Century            '94-95
   Chevy Celebrity          '88-90
   Chevy Lumina Van         '90-91
   Chevy Lumina Van         '92-95
   Olds Ciera                  '88
   Olds Ciera                  '89  2.5L & 2.8L
   Olds Ciera               '90-93    four cylinder
   Olds Ciera               '94-95
   Olds Silhouette          '90-91
   Olds Silhouette          '92-94
   Pontiac 6000             '88-89    FWD
   Pontiac 6000                '90  2.5L  FWD
   Pontiac 6000                '91  2.5L
   Pontiac Trans Sport      '90-95

TH-125 transmissions from the cars below can be used in the '88 Fiero by switching the torque converter lock-up wiring and switches.

   Buick Century            '89-93  3.3L
   Olds Ciera                  '89  3.3L
   Olds Ciera               '90-93  six cylinder
   Pontiac 6000                '90  3.1L FWD
   Pontiac 6000                '91  3.1L

Alternative Automatic Transmissions
It is feasible to install newer-design automatic transmissions in a Fiero such as GM's TH440-T4. With some qualification this can result in better acceleration and improved mileage. A thorough discussion with directions to relative web sites can be found at The Ogre's Cave.