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Old 02-14-2019, 10:21 PM
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Mustang II suspension issue

Returning to street rodding today after a 43 year absence! Just like riding a bike, except I missed out on the whole "drop in a Mustang II suspension" thing. My '41 Lincoln street rod, delivered today, has one and it rides like a buckboard. Looking at the springs, they appear to be extremely short, which would explain the lousy ride. So I ask of all those familiar with these installations- what's the cure? And if the answer is replace the spring with a full length one, how the heck do I figure out which spring to order to keep ride height the same?
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Old 02-14-2019, 11:31 PM
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Mii

That appears to be a stock MII unit right from the junkyard and has been converted to coil over shocks. It also appears to be a power rack, correct? Are the lower A arms parallel to the ground? It also looks like the springs have been adjusted up to put more tension on them which would reduce travel and give a harsh(er) ride. Do you know the weight of the vehicle? Take it down to the local truck stop or wherever and get the front, rear and total weight so that a proper spring can be ordered. What are you planning for upgrades? What is the rear suspension? Pictures of the car too please.
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Old 02-15-2019, 10:35 AM
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Here is your best source for MII parts.....
https://www.eatondetroitspring.com/a...on/mustang-ii/
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Old 02-15-2019, 11:57 AM
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I agree with 39 master. Get the car weighed front and rear. Try and get a straight on shot of the suspension on one side.

Just looking at this picture it looks like an aftermarket chrome spring. These only come in 375, 500,700 pound ratings. They are short than stock to get the ride height down. In any event it’s important to get the lower arm parallel to the ground. There are dropped spindles available from a number of suppliers to help this.
You can also use an anti roll bar. There are several available.

For now that’s about all we can do until you give us more info.

Typical coil over shock conversions like this are very stiff. I’ve had my adjustable shocks revalved a couple times but they still were very stiff. It doesn’t look like yours are adjustable. There would be a small knob at the bottom by the control arm.
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Old 02-16-2019, 06:44 AM
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My Pontiac has an original 1974 MII suspension, still has the stock MII springs, shocks upgraded to KYB Gas shocks. The ride is smooth
Brakes upgraded to 11" rotors from Speedway.
PS rack replaced with '88 T-bird unit from Speedway.
As suggested, get your car weighed and get springs correct for the weight.
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Old 02-16-2019, 08:14 AM
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Those are aftermarket Coil over springs and shocks. The spring looks weak for the car you have. You'll need a higher spring rate. Check the manufacturer of your springs and shocks and call them to discuss options.
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Old 02-17-2019, 12:40 PM
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[QUOTE=39 master;4654853]That appears to be a stock MII unit right from the junkyard and has been converted to coil over shocks. It also appears to be a power rack, correct?

Correct.

Are the lower A arms parallel to the ground?

Yes

It also looks like the springs have been adjusted up to put more tension on them which would reduce travel and give a harsh(er) ride.

Probably adjusted this way to lower the car, but results in a harsher ride

Do you know the weight of the vehicle?

Probably around 4000 lbs. It's 4300 curb weight with the V-12 and estimate the 350 SBC knocks 300 lbs off. Not sure how the Mustang II vs transverse leaf affects the weight.

Take it down to the local truck stop or wherever and get the front, rear and total weight so that a proper spring can be ordered. What are you planning for upgrades?

None, just want to maintain ride height and improve the ride

What is the rear suspension?

Conventional leaf springs, transverse leaf is gone. 9" Ford rear.
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Old 02-17-2019, 12:48 PM
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Quote:
Originally Posted by Bob37pont View Post
My Pontiac has an original 1974 MII suspension, still has the stock MII springs, shocks upgraded to KYB Gas shocks. The ride is smooth
Brakes upgraded to 11" rotors from Speedway.
PS rack replaced with '88 T-bird unit from Speedway.
As suggested, get your car weighed and get springs correct for the weight.

I probably need stock springs so there is sufficient suspension travel



Brakes upgraded to 11" rotors from Speedway.

Mine look like 9", I'm sure I need this upgrade


As suggested, get your car weighed and get springs correct for the weight.

I can probably do that at the county dump, where they weigh your vehicle before and after. Not sure if that alone will tell me the correct weight. From what I've read, the engine sets back much farther in a street rod than in a Mustang II, resulting in less weight on the suspension than you might think.


[/QUOTE]
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Old 02-17-2019, 12:55 PM
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The springs shown with the coil over shocks appear to be shorter than stock. Then to get the ride height they are adjusted up what looks to be about 1 1/2 inches. These shocks do not compress the spring. They only provide ride height adjustment.

Mainstreet.. is probably right, you need a stock type spring. There are several rates available in the like by inspector. You would use a stock type shock too.
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Old 02-17-2019, 01:03 PM
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Quote:
Originally Posted by bentwings View Post
The springs shown with the coil over shocks appear to be shorter than stock. Then to get the ride height they are adjusted up what looks to be about 1 1/2 inches. These shocks do not compress the spring. They only provide ride height adjustment.

Mainstreet.. is probably right, you need a stock type spring. There are several rates available in the like by inspector. You would use a stock type shock too.

Would like to avoid having this done at a shop, but the job is a bit out of my wheelhouse- especially concerned about compressing the spring with a tool as described in multiple Youtube videos. Can the spring be installed by putting the front car frame on jack stands, removing the spindle, dropping the control arm with a jack, replacing the spring and jacking up to compress?
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Old 02-17-2019, 07:31 PM
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Suspension

The shock and spring are one unit that would be removed together. I think you are looking at the procedure for coil springs.


Just unbolt the shock top and bottom with the car jacked up far enough to drop the coilovers out the bottom. If you don't have the spanner wrench to undo the spring nut a local repair shop should have one. Not to worry, the spring will not go flying and it's best to lube the threads before undoing the nut. Once the spring is removed you will be able to check the shock for proper action.
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Old 02-17-2019, 07:38 PM
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[QUOTE=39 master;4655287]The shock and spring are one unit that would be removed together. I think you are looking at the procedure for coil springs.


I was looking at the procedure for coils because I was considering replacing the coilovers with conventional springs. However, I don't see any reason why coilovers wouldn't work if the springs were not so short- most I see in internet photos are nearly the full length of the shock.
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Old 02-18-2019, 05:13 AM
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Stick with the coil overs. They work better and are far more adjustable. You have the wrong springs in there now.
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Old 02-18-2019, 07:59 AM
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Quote:
Originally Posted by '48 Austin View Post
Stick with the coil overs. They work better and are far more adjustable. You have the wrong springs in there now.
So if the existing shocks are working, is there any reason to replace them along with the springs? I'm trying to figure out what brand they are and if they have adjustable damping.
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Old 02-18-2019, 08:32 AM
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paper method of car weight

Here's a paper method I've used on a couple of my cars. If you get within 10% you have done it right.

https://www.youtube.com/watch?reload=9&v=KUjIm1jzU4U
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