Eaton Detroit Spring

Pontiac Firebird
1970 - 1981 Application Guide

& Ordering

Select Ride Height and Click Part Number to order
Rev.
6/2010
Engine
Front Coil Springs - Sold Per Pair
Rear Leaf Springs - Sold Per Each
Without A/C
With A/C
Part No.
 Note
Lvs.
Width
Rate
Load
Standard Duty
Heavy Duty
Standard Duty
Heavy Duty

1970

Coupe - To 2/10/70 - With F60 X 15" Tires
250
 
 
Left
4
2 1/2
89
545
Right
5
2 1/2
88
580
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1970

Coupe - To 2/10/70 - Except F60 X 15" Tires
250
 
 
Left
4
2 1/2
89
545
Right
5
2 1/2
88
580
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
     
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1970

Coupe - After 2/10/70 - With F60 X 15" Tires
250
 
 
Left
4
2 1/2
89
545
Right
5
2 1/2
88
580
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1970

Coupe - After 2/10/70 - Except F60 X 15" Tires
250
 
 
Left
4
2 1/2
89
545
Right
5
2 1/2
88
580
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1970

Formula 400 - To 2/10/70 - With F60 X 15" Tires
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1970

Formula 400 - To 2/10/70 - Except F60 X 15" Tires
400
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1970

Formula 400 - After 2/10/70 - With F60 X 15" Tires
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1970

Formula 400 - After 2/10/70 - Except F60 X 15" Tires
400
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1970

Trans Am - To 2/10/70
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1970

Trans Am - After 2/10/70
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1971

Coupe - With F60 X 15" Tires
250
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1971

Coupe - Except F60 X 15" Tires
250
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
350
 
 
Left
4
2 1/2
88
580
Right
5
2 1/2
89
545
400
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1971

Formula - With F60 X 15" Tires
350, 400
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
595
Right
4
2 1/2
126
535

1971

Formula - Except F60 X 15" Tires
350, 400
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535
455
 
 
Left
4
2 1/2
126
635
Right
4
2 1/2
126
535

1971

Trans Am
455
 
 
Left
4
2 1/2
126
535
Right
4
2 1/2
126
595

1972

Coupe
250
 
 
 
4
2 1/2
88
580
350
 
 
Std. Duty
4
2 1/2
103
535
HD
4
2 1/2
126
595
400
 
 
 
4
2 1/2
126
635

1972

Formula
350, 400
 
 
 
4
2 1/2
126
595
455
 
 
 
4
2 1/2
126
595

1972

Trans Am
455
 
 
 
4
2 1/2
126
635

1973

Coupe
250
 
 
 
4
2 1/2
88
580
350
 
 
Std. Duty
4
2 1/2
88
580
HD
4
2 1/2
126
595
400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1973

Formula
350, 400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1973

Trans Am
455
 
 
 
4
2 1/2
126
635

1974

Coupe
250
 
 
 
4
2 1/2
88
580
350
 
 
Std. Duty
4
2 1/2
88
580
HD
4
2 1/2
126
595
400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1974

Formula
350, 400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1974

Trans Am
400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1975 - 76

Coupe

250
 
 
Std. Duty
5
2 1/2
125
650
HD
4
2 1/2
126
635
350
 
 
Std. Duty
5
2 1/2
125
650
HD
4
2 1/2
126
635
400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1975 - 76

Formula
350, 400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1975 - 76

Trans Am
400
 
 
 
4
2 1/2
126
635
455
 
 
 
4
2 1/2
126
635

1977

Coupe
231
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
301, 305
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350 Chev
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350 Olds
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1977

Esprit
350 Chev
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350 Olds
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1977

Formula
301, 305
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350 Chev
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350 Olds
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
400
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
403
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1977

Trans Am
400
 
4
2 1/2
126
635
403
 
4
2 1/2
126
635

1978

Coupe & Esprit
231
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
305
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1978

Formula
305
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350
 
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
400
 
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
403
 
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1978

Trans Am
400
 
 
4
2 1/2
126
635
403
 
4
2 1/2
97
645

1979

Coupe & Esprit
231
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
301, 305
 
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
350
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1979

Formula
301
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
305, 350
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
400
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635
403
 
Std. Duty
4
2 1/2
97
645
HD
4
2 1/2
126
635

1979

Trans Am
301
 
 
4
2 1/2
126
635
400
 
 
4
2 1/2
126
635
403
 
 
4
2 1/2
126
635

1980

Coupe & Esprit
231
 
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
265, 301, 305
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635

1980

Formula
301
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
301 Turbo
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
305
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635

1980

Trans Am
301
 
 
4
2 1/2
126
635
301 Turbo
 
 
4
2 1/2
126
635
305
 
4
2 1/2
126
635

1981

Coupe
231
 
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
265, 301
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
350
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635

1981

Esprit
231
 
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635

1981

Formula
265, 301, 305
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635
301 Turbo
 
Std. Duty
5
2 1/2
92
685
HD
4
2 1/2
126
635

1981

Trans Am
301, 305
 
 
4
2 1/2
126
635
301 Turbo
 
 
4
2 1/2
126
635
All Part Numbers listed above are Stock Ride Height. Coil Springs are available lifted or lowered up to 2 Inches, in 1 Inch increments. Leaf Springs are available lifted or lowered up to 3 Inches, in 1 Inch increments.
Coil springs are sold Per Pair. Leaf Springs are sold Per Each. For a Pair of Coil Springs, order 1. For a pair of Leaf Springs, order 2.
Lifting or lowering Coil Springs adds $30.00 per pair. Lifting or Lowering Leaf Springs adds $20.00 per spring.
We offer many springs that are not listed here. If you don't see your application, or need something custom, please Contact Us.

Leaf Spring Installation Kits

   

Application

Part No.

          
   
70 - 81 Multi Leaf
$109.00
          
   
70 - 81 Mono to Multi Conversion
$65.00
          
Installation Kits Include all necessary hardware to install one Pair of Leaf Springs
Including: Rear Shackles with Bushings, Front Eye Bolts, Insulator Pads, Hanger Clips, U-Bolts, T-Bolts
EATON Detroit Spring Inc.
1555 Michigan Avenue
Detroit, MI 48216
Phone: 1-313-963-3839
Fax: 1-313-963-7047