Front spring rates

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Front spring rates

Post by bigredlaguna on Sat Jun 12, 2010 4:39 pm

This is a list of spring specs for the front of 73-77 A-body cars.
Part numbers and specifications are from NAPA.

2771128 # Coil Spring Coils : 9.47 Coil Spring Free Height : 16.65"
Coil Spring I.D. : 4.08" Spring Rate : 460
Wire Diameter : .75"

2771132 # Coil Spring Coils : 9.42 Coil Spring Free Height : 17.05"
Coil Spring I.D. : 4.08" Spring Rate : 419
Wire Diameter : .718"

2771430 # Coil Spring Coils : 9.92 Coil Spring Free Height : 17.5"
Coil Spring I.D. : 4.08" Spring Rate : 358
Wire Diameter : .7"

2771432 # Coil Spring Coils : 9.5 Coil Spring Free Height : 16.35"
Coil Spring I.D. : 4.08" Spring Rate : 400
Wire Diameter : .705"

2771829 # Coil Spring Coils : 9.57 Coil Spring Free Height : 16.42"
Coil Spring I.D. : 4.03" Spring Rate : 436
Wire Diameter : .718"

2771840 # Coil Spring Coils : 9.83 Coil Spring Free Height : 17.62"
Coil Spring I.D. : 4.08" Spring Rate : 370
Wire Diameter : .705"

2771875 # Coil Spring Coils : 9.68 Coil Spring Free Height : 17.38"
Coil Spring I.D. : 4.04" Spring Rate : 411
Wire Diameter : .718"

2771948 # Coil Spring Coils : 9.83 Coil Spring Free Height : 17.92"
Coil Spring I.D. : 4.09" Spring Rate : 319
Wire Diameter : .672"

2771954 # Coil Spring Coils : 10.08 Coil Spring Free Height : 17.39"
Coil Spring I.D. : 4.08" Spring Rate : 388
Wire Diameter : .718"

2771956 # Coil Spring Coils : 10.06 Coil Spring Free Height : 17.65"
Coil Spring I.D. : 4.08" Spring Rate : 338
Wire Diameter : .69"

2771967 # Coil Spring Coils : 10.48 Coil Spring Free Height : 18.51"
Coil Spring I.D. : 4.09" Spring Rate : 294
Wire Diameter : .672"

2771981 # Coil Spring Coils : 11.01 Coil Spring Free Height : 17.5"
Coil Spring I.D. : 3.68" Spring Rate : 293
Wire Diameter : .625"

2772007 # Coil Spring Coils : 9.52 Coil Spring Free Height : 17.25"
Coil Spring I.D. : 4.08" Spring Rate : 352
Wire Diameter : .69"

2772058 # Coil Spring Coils : 9.55 Coil Spring Free Height : 16.83"
Coil Spring I.D. : 4.04" Spring Rate : 393
Wire Diameter : .705"

2772062 # Coil Spring Coils : 8.81 Coil Spring Free Height : 15.87"
Coil Spring I.D. : 4.08" Spring Rate : 500
Wire Diameter : .75"

2772072 # Coil Spring Coils : 9.09 Coil Spring Free Height : 15.93"
Coil Spring I.D. : 4.08" Spring Rate : 406
Wire Diameter : .705"

2773021 # Coil Spring Coils : 9.49 Coil Spring Free Height : 17.05"
Coil Spring I.D. : 4.09" Spring Rate : 303
Wire Diameter : .656"

2773068 # Coil Spring Coils : 10.06 Coil Spring Free Height : 18.06"
Coil Spring I.D. : 4.08" Spring Rate : 334
Wire Diameter : .69"

2773096 # Coil Spring Coils : 9.09 Coil Spring Free Height : 16.31"
Coil Spring I.D. : 4.08" Spring Rate : 433
Wire Diameter : .718"

2773098 # Coil Spring Coils : 9.98 Coil Spring Free Height : 17.05"
Coil Spring I.D. : 4.09" Spring Rate : 298
Wire Diameter : .656"

2773142 # Coil Spring Coils : 9.95 Coil Spring Free Height : 18.52"
Coil Spring I.D. : 4.09" Spring Rate : 306
Wire Diameter : .672"

2773143 # Coil Spring Coils : 9.52 Coil Spring Free Height : 16.99"
Coil Spring I.D. : 4.08" Spring Rate : 355
Wire Diameter : .69"

2773144 # Coil Spring Coils : 9.13 Coil Spring Free Height : 16.12"
Coil Spring I.D. : 4.04" Spring Rate : 414
Wire Diameter : .705"

2773214 # Coil Spring Coils : 9.55 Coil Spring Free Height : 17.14"
Coil Spring I.D. : 4.09" Spring Rate : 329
Wire Diameter : .672"

2773216 # Coil Spring Coils : 9.55 Coil Spring Free Height : 17.52"
Coil Spring I.D. : 4.09" Spring Rate : 329
Wire Diameter : .672"

2773218 # Coil Spring Coils : 10.06 Coil Spring Free Height : 17.31"
Coil Spring I.D. : 4.08" Spring Rate : 340
Wire Diameter : .69"

2773229 # Coil Spring Coils : 9.27 Coil Spring Free Height : 16.63"
Coil Spring I.D. : 4.08" Spring Rate : 343
Wire Diameter : .672"

2773256 # Coil Spring Coils : 9.09 Coil Spring Free Height : 16.4"
Coil Spring I.D. : 4.08" Spring Rate : 441
Wire Diameter : .718"

I will post up what models/makes had what part #'s in future posts.
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Re: Front spring rates

Post by The Dude on Sat Jun 12, 2010 10:05 pm

You da man!
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Re: Front spring rates

Post by bigredlaguna on Sun Jun 13, 2010 2:40 am

1973 Chevelle, Station wagon, El Camino, and Monte Carlo.

2773214 = SBC w/o air
2773144 = SBC heavy duty w/o air, I6 heavy duty w/air
2771432 = SBC w/air, BBC w/o air
2772058 = BBC w/air
2773096 = BBC heavy duty w/o air, SBC heavy duty w/air
2771829 = BBC heavy duty w/air
2772072 = Station wagon heavy duty w/I6
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Re: Front spring rates

Post by bigredlaguna on Fri Jun 18, 2010 11:43 pm

1973 Buick Regal/Century


2773218 = 350 w/air. 2-door Base
2771954 = 350 w/air. 2-door Regal
2773256 = (350 ?) w/o air. 2-door Regal, 4-door, Station wagon
2771132 = (350 ?) w/air 4-door
2773214 = 350 w/o air 2-door Base
2772062 = 350 w/air, heavy duty. 2-door Regal



1973 Oldsmobile Cutlass

2771132 = 455 and 350 w/air heavy duty. 4-door(350) and 2-door(455)
2771430 = 455 and 350 w/o air. 4-door(350) and 2-door(455)
2773068 = 455 and 350 w/air. 2-door(455) 4-door(350) (455 w/o air)
2771956 = 350 w/o air. 2-door
2771840 = 455 w/air. 4-door
2772058 = 350 w/o air heavy duty. 2-door



1973 Pontiac Grand Am

2772058 = 400, 455 w/o air, heavy duty
2772007 = 400, 455 w/o air
2771430 = 400, 455 w/air

1973 Pontiac Grand Prix

2772007 = w/air conditioning
2771829 = w/air conditioning, heavy duty
2773143 = w/o air
2771432 = w/o air, heavy duty

Pontiac LeMans

2773256 = 350 w/air, heavy duty. Station wagon; Base and Safari
2773096 = 350 w/o air, heavy duty. Station wagon
2771956 = 350 w/air. Station wagon; Base and Safari
2771829 = 400, 455 w/air, heavy duty. Station wagon
2771840 = 400, 455 w/air. Station wagon
2771430 = 400, 455 w/o air. Station wagon
2773098 = 250 I6 w/o air. Station wagon
2773216 = 350 w/o air. Station wagon
2773143 = 250 I6 w/air. Station wagon
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Re: Front spring rates

Post by bigredlaguna on Sat Jun 19, 2010 1:03 am

1974 Chevrolet Malibu


2773256 = SBC Station wagon
Estate, Classic w/o air, heavy duty
Base, Landau w/air, heavy duty

2772058 = SBC Station wagon
Estate, Classic w/o air
Base, Landau w/air

2773218 = Station wagon, Sedan
Estate, Classic w/air



1974 and 1975 Chevrolet Monte Carlo


2771432 = SBC w/air, BBC w/o air
2773256 = BBC w/ air, heavy duty
2772058 = BBC w/air

1976 Monte Carlo

2771976

1977 Monte Carlo

2771977



1974 Chevrolet Truck El Camino

2771432 = SBC w/air conditioning
2773256 = SBC w/o air, heavy duty
2772058 = SBC w/o air
2771132 = BBC w/o air, heavy duty
2771840 = BBC w/o air
2771128 = BBC w/air, heavy duty
2771875 = BBC w/air




1974 Buick Century/Regal


2773214 = 350 w/o air
2773218 = 350 w/air
2772062 = 455 w/o air
2771128 = 455 w/air


1974 Oldsmobile Cutlass


2771132 = 350, 455 4-door w/air, heavy duty. 455 2-door w/air, heavy duty
2772058 = 350 w/o air, heavy duty 2-door
2771430 = 350 2-door w/air, 4-door w/o air. 455 2-door w/o air
2773068 = 350 4-door w/air, 455 4-door w/o air, 455 2-door w/air
2771956 = 350 2-door w/o air
2771840 = 455 4-door w/air


1974, 1975, 1976 Pontiac Grand Prix


2773143 = w/o Air Conditioning
2771432 = w/o Air Conditioning, heavy duty
2771829 = w/Air Conditioning, heavy duty
2772007 = w/ Air Conditioning

1974 Pontiac LeMans


2773214 = 250 I6 w/air. Station wagon and Sedan
2773021 = 250 I6 w/o air. Station wagon and Sedan
2772007 = 350, 400, 455 w/air. Station wagon
2773143 = 350, 400, 455 Station wagon w/o air; Sedan w/air
2773214 = 350, 400, 455 Sedan w/o air
2771432 = 350, 400, 455 Station wagon w/o air, heavy duty; Sedan w/air, heavy duty
2772058 = 350, 400, 455 Station wagon w/air, heavy duty


Last edited by bigredlaguna on Sat Jun 19, 2010 4:49 pm; edited 2 times in total
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Re: Front spring rates

Post by bigredlaguna on Sat Jun 19, 2010 2:35 pm

1975 Chevrolet Malibu
2771430 = SBC w/air. 4-door
2771132 = SBC w/air, heavy duty. Station wagon (1976 also)
2772007 = SBC w/o air. 4-door(1975) w/air(1976)


1976 Chevrolet Malibu
2773214 = SBC w/o air. 4-door
2771432 = SBC w/o air, heavy duty. 4-door
2772058 = SBC w/air, heavy duty. 4-door


1977 Chevrolet Malibu
2773216 = SBC w/o air. 4-door, Landau and Base
2773256 = SBC w/air, heavy duty. 4-door
2771967 = SBC w/air. 4-door, Landau and Base
2773096 = SBC w/o air, heavy duty. 4-door. Station wagon w/air
2773142 = SBC w/air. 4-door, Classic
2771432 = SBC w/o air. Station wagon
2771948 = SBC w/o air 4-door, Classic
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Re: Front spring rates

Post by bigredlaguna on Sat Jun 19, 2010 3:00 pm

1975, 1976, 1977 Chevrolet Truck El Camino

2773256 = SBC w/air, heavy duty
2771132 = BBC w/air, heavy duty (1975 only)
2771430 = SBC w/air
2771954 = BBC w/o air (1975 only)
2771432 = 250 I6 w/air, heavy duty; SBC w/o air, heavy duty
2772007 = 250 I6 w/air; SBC w/o air
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Re: Front spring rates

Post by bigredlaguna on Sat Jun 19, 2010 4:44 pm

1975 and 1976 Buick Century

2773214 = V6 w/air (1977 also)
2773229 = V6 w/o air
2772007 = 350 w/air (1977 also)
2773144 = 350 w/o air, heavy duty (1977 also)

1977 Buick Century

2773256 = 350 w/air, heavy duty. 2-door; 305,350 w/air, heavy duty. Station wagon

2773096 =
305, 350, 403 w/o air, heavy duty. Station wagon
V6 w/air, heavy duty. 4-door

2771956 = 350 w/o air. 4-door
2771829 = 350 w/manual transmission, heavy duty. 4-door
2773216 = 350 2-door
2773068 = 350 w/air. 4-door


1975, 1976, 1977 Oldsmobile Cutlass

2771956 =

250 I6 w/air. 2-door
260 V8 w/air. Station wagon
260 V8 w/o air. 2-door
350 w/o air. 4-door
455 w/o air. Station wagon

2772007 =

250 I6 w/o air. 4-door
260, 350 V8 w/o air. Station wagon
455 w/o air. 4-door

2771829 =

260, 350 V8 w/air, heavy duty. 2-door and Station wagon
260, 350 V8 w/o air, heavy duty. 4-door
455 w/air, heavy duty. 4-door

2771430 =

250 I6 w/air. 4-door
260, 350 V8 w/air. 2-door and 4-door
455 w/air. 4-door

2773096 = 260 V8, 350 w/o air, heavy duty. 2-door

2773218 = 455 w/o air. 2-door

2773256 =

260 V8, 350 w/air, heavy duty. 4-door
455 w/air, heavy duty. Station wagon

2771432 =

250 I6 w/o air, heavy duty. 2-door
260 V8, 350 w/o air, heavy duty. Station wagon
455 w/o air, heavy duty. 2-door and 4-door

2772058 =

250 I6 w/o air, heavy duty. 4-door
455 w/o air, heavy duty. Station wagon
455 w/air, heavy duty. 2-door

2773216 = 250 I6 w/o air. 2-door


1976 Oldsmobile Cutlass

2773144 =

250 I6 w/o air, heavy duty. 2-door and 4-door
260 V8, 350 w/o air, heavy duty. Station wagon

2773143 =

250 I6 w/o air. 2-door and 4-door
260 V8, 350 w/o air. Station wagon

1977 Oldsmobile Cutlass

2773218 = 260 V8, 350, 403 w/o air. 2-door and 4-door

2773214 = 231 V6 w/o air. 2-door and 4-door

2773098 = 231 V6 w/o air. 2-door
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Re: Front spring rates

Post by bigredlaguna on Sat Jun 19, 2010 6:36 pm

1975 Pontiac Grand Am

2772058 = 400 w/air, 455 w/o air
2771430 = 455 w/air
2771432 = 400 w/o air
2773256 = 455 w/o air, heavy duty; 400 w/air, heavy duty
2773096 = 400 w/o air, heavy duty


1975 Pontiac LeMans

2772058 =350, 400, 455 w/air 2-door and 4-door (1976 also)
2771432 = 250 I6 w/air, heavy duty. 2-door (1976, 1977 also)
2773096 = 350, 400, 455 w/o air, heavy duty. 2-door and 4-door
2771829 = 350, 400, 455 w/o air, heavy duty. Station wagon
2771430 = 350, 400, 455 w/air. Station wagon (1976 also)
2773256 = 350, 400, 455 w/air, heavy duty. 2-door and 4-door (1976 also)
2772007 = 350, 400, 455 w/o air. Station wagon (1976 also)
2773214 = 250 I6 w/o air. 2-door (1976, 1977 also)
2773143 = 250 I6 w/air. 2-door (1976, 1977 also)


1976 Pontiac LeMans

2771132 = 455 w/air, heavy duty. Station wagon
2771840 = 455 w/air. Station wagon


1977 Pontiac LeMans

2772072 =

3.8L 231 V6 w/air, heavy duty. 2-door, 4-door, and Station wagon
301 2-door, heavy duty
301 w/o air, heavy duty. 4-door, Station wagon
350 w/o air, heavy duty. 4-door Base
350 VIN code R w/o air, heavy duty. 2-door Grand Lemans
403 w/o air, heavy duty. 2-door, 4-door
400 w/o air, heavy duty. 4-door

2773144 =

350 VIN code R, 403 w/air, heavy duty. 2-door, 4-door Grand Lemans
400 w/o air, heavy duty. Station wagon
403 w/air, heavy duty. 4-door
350 w/air, heavy duty. 4-door Base
350 VIN code P, 400 w/o air, heavy duty. 4-door Grand Lemans
400 w/air, heavy duty. 2-door, 4-door
301 w/air, heavy duty. Station wagon
350 w/air, heavy duty. 2-door


2773229 =

350 VIN code R, 403 w/o air. 4-door Base
3.8L 231 V6 w/air. 4-door
301 w/o air. 2-door, 4-door


2773218 = 400, 350 code P w/air. 4-door Grand Lemans

2773021 = 3.8L 231 V6 w/o air. 2-door, Station wagon



1977 Pontiac Grand Prix


2773143 = 350, 403 w/o air, 301 w/air
2773144 = 350, 403 w/o air, 301 w/air, heavy duty
2772072 = 301 w/o air, heavy duty
2772007 = 403, 350 w/air
2773096 = 403, 350 code P w/air, heavy duty
2771432 = 350 code R w/air, heavy duty
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Re: Front spring rates

Post by bigredlaguna on Mon Aug 08, 2011 11:16 pm

In case anyone is interested, this is the formula for figuring the rate of a spring.

11,250,000 x (wire diameter to the fourth power) divided by 8 x # of active turns x (mean diameter cubed)

Active turns are the number of turns of the spring that do not touch anything.

Mean diameter is figured by adding the inside diameter and the wire thickness together.

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Re: Front spring rates

Post by pila on Tue Aug 09, 2011 12:12 am

If I was smart enough to figure out that formula I would be rich instead of a dumb wrench ! Very Happy
Great list. Had no idea there were so many different springs.

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Re: Front spring rates

Post by 74Guna on Mon Sep 26, 2011 12:46 am

Very Impressive!! Thank you for the spring info, I've had a lot of questions about spring rates and sway bars. I think it was CHP had an article about balancing rate and sway bar stiffness. Fat Man Fab catalog has some interesting info for spring rates for GM A bodies in their catalog. Thanks Again!
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Which Spring is the one

Post by testpilot61 on Fri Feb 19, 2016 1:56 pm

First let me say I am absolutely sure I don't know much about which spring I can install that will lower my Malibu 2" and still give me a decent ride.

I have added many new parts that have substantially reduced front end weight.  I'm now ready to update to larger wheels to improve handling and make the car look much better.

So, with all that being said could someone in the Forum give me a heads up for front and rear springs.

Thanks a bunch,

testpilot61


Last edited by testpilot61 on Fri Feb 19, 2016 1:59 pm; edited 1 time in total

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Re: Front spring rates

Post by testpilot61 on Fri Feb 19, 2016 1:59 pm

Yikes, I should have included the word (Know).

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Re: Front spring rates

Post by Hawk03 on Fri Feb 19, 2016 2:14 pm

This thread has some info.

http://www.g3gm.com/t6388-dse-lowering-springs-thoughts

I went with Belltech all the way around and they seem okay. I've only driven the car less than 100 miles with them installed although they have been installed on the car for 2 or so years. I will need to install their rear shock as well since the stock shock has more travel and the spring rattles around going over bumps.
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Re: Front spring rates

Post by Joe73 on Fri Feb 19, 2016 6:32 pm

Moog has a cool chart of all their spring models and exact specs like height, installed height and spring rate. Great for comparisons.

Left side of the page.
http://www.moogproblemsolver.com/suspension/coil-springs
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Re: Front spring rates

Post by bigredlaguna on Sat Feb 20, 2016 5:21 pm

testpilot61 wrote:First let me say I am absolutely sure I don't know much about which spring I can install that will lower my Malibu 2" and still give me a decent ride.

I have added many new parts that have substantially reduced front end weight.  I'm now ready to update to larger wheels to improve handling and make the car look much better.

So, with all that being said could someone in the Forum give me a heads up for front and rear springs.

Thanks a bunch,

testpilot61

I have to dig up some notes I took from way back when, but the first thing you need to do is to weigh your car so you exactly how much weight is supported by the front and rear tires. You then subtract the weight of the unsprung weight (wheels/tires/axle/spindles/brake components) to know how much is actually supported by the spring. You can then do the math to figure out how much the weight of your car will compress a given spring. The rear springs are easy to figure out, but the front suspension needs a third class lever formula to figure out the load height.

If you don't want to do the math, at least the information gained from weighing your car will give a tech at the spring mfr. a much better chance of getting you at the ride height and quality you are searching for.
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Re: Front spring rates

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