Tiha

need new springs but unsure which one from MOOG

455 W/O AC stock height

Summit:

https://www.summitracing.com/int/par...-size/7-5l-455

https://www.summitracing.com/int/par...-size/7-5l-455

https://www.summitracing.com/int/par...-size/7-5l-455


the same for the rear, may some one can help

thanks

Fun71

Here's some info on front springs from a Moog suspension catalog that I archived many years ago:


Here's some spring info I archived a while back:

> 5390 small block - no AC
> wire diameter = 0.650"
> load height = 11.000"
> load = 1952 pounds
> rate per inch = 336 pounds
> free height = 16.808"
>
> 5382 big block - no AC, small block - AC
> wire diameter = 0.660"
> load height = 11.000"
> load = 2066 pounds
> rate per inch = 360 pounds
> free height = 16.724"
>
> 5400 big block - AC
> wire diameter = 0.660"
> load height = 11.000"
> load = 2167 pounds
> rate per inch = 360 pounds
> free height = 17.004"
>
> 5536 442 small block - AC - heavy duty, 442 big block - no AC - heavy duty
> wire diameter = 0.690"
> load height = 11.000"
> load = 1984 pounds
> rate per inch = 488 pounds
> free height = 15.063"
>
> 5450 small block - AC - heavy duty, big block - no AC - heavy duty, -442 big block - AC - heavy duty
> wire diameter = 0.690"
> load height = 12.000"
> load = 1642 pounds
> rate per inch = 454 pounds
> free height = 15.616"

Tiha

think with 360 pounds rate per inch we would be happy

> 5382 big block - no AC, small block - AC
> wire diameter = 0.660"
> load height = 11.000"
> load = 2066 pounds
> rate per inch = 360 pounds
> free height = 16.724"

thanks

Fun71

I have the 5536 springs on my car and I am very pleased withe them. The ride is much firmer without being harsh at all, and the ride height is similar to what it was with the old, worn, original springs.

Tiha

do you have AC ?

Fun71

Yes. The places I've lived (Gulf Coast and Arizona), ya can't live without it.

mpolds

I have a few last sets of the 5400 MOOG spring which I am liquidating....
trimming my once massive Coil Springs Inventory......
If any of you want a set --- let me know ----
Craig -- 516 - 485 - 1935 .... Long Island, New York

poss

The AMA book says the spring rates are Cutlass(336), HD(360)?, 442(435)
The installed height on our cars is 11.3"
So the free spring height, minus the installed height, x the spring rate = Load rate
To compare Moog;
Spring number spring free height Load height Difference Rate Load
5390 16.80 11.3 5.5 336 1848
5536 15.06 11.3 3.76 487 1831
5382 16.72 11.3 5.42 360 1951
5450 15.63 11.3 4.33 450 1948
5400 17.00 11.3 5.70 360 2052
You can see the load difference is about 100lbs per spring= 200lbs a pair.
So if you have a cutlass with a 350 motor and have 5536 and like the height, then add a 455 and ac,(+190lbs), then 5450 springs would keep the same height. Or you could just add heaver load springs to increase stance height.
:
When considering springs you need to look at the load number also. Since
the weight of the car remains constant you can adjust height with the
springs rated load and the free height. Multiplying the rated load (in
inch/pounds) by how far the spring compresses (in inches) you'll come up
with a load number in pounds
:
The GM # 402084 crosses over to the 5536 spring.

cdrod

Poss:
The load numbers you posted are different from those provided by Fun71 and I have the same numbers as Fun71. Where did you get your load data and which is correct?
I have a small block w/AC but I have aluminum heads, intake, water pump & AC compressor and a few other lighter parts too. I estimate my total weight reduction to be approx. 150 lbs. I chose the Moog5450 spring because of the 454 spring rate but the load difference from a stock small block w/AC is 424 lbs. (2066 lbs.-1642 lbs. based on Fun71's numbers). Might be too much of a difference?
Using your load numbers the difference is only 3 lbs. (1951-1948). Thx.
Rodney

poss

Hi.... The values i listed i calculated myself based on the olds installed height of 11.3" The listed fun71 values are what is listed on
the Moog website. You will notice the installed height is different for all of them, 11" for most, 12" for one. But olds is 11.3". The springs fit other cars, like Buick. So the 5450 is 15.63 long and compressed down to 11.3" installed, (4.33" compressed). So 4.33" x 450lbs per inch = 1948 lbs loaded weight.

poss

Hey Rodney....
The 442 sat a little lower than a cutlass i think.....So with your lightened 350 you should sit a bit higher with the 5450 than a stock cutlass.
With your 350 the 5536 should sit a bit higher than a 442....

cdrod

Poss:
Thanks for the clarification on your load numbers, that makes perfect sense. I've already bought the 5450 springs and I've made alot of changes to my car including suspension components so the Moog application notes aren't a sure thing. I'll use the 5450 springs as a starting point and make adjustments from there if neccessary. If the stance is too high but I like spring rate, I can always trim the coils to lower the stance.