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C3 front Coil Spring installation 101

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Old Aug 6, 2023 | 02:02 AM
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Default C3 front Coil Spring installation 101

There have been a lot of posts and threads on here over the years asking how to install front coil springs.
So, I've had the displeasure of having my coil springs in and out and in again more times than I can remember. So after many times I have this job down pat so to say and I believe I have found the easiest way.
So, I'll walk everyone through it.
Keep in mind this is done in a tiny one car garage with the front of the car on jackstands. Nothing fancy and certainly not a ton of room. So basically anyone with basic tools and a pair of jackstands can do this.
Speaking of basic tools. In addition to a pair of jackstands and basic wrenches and sockets. You will also need a small to medium floor jack. And a coil spring compressor. If you don't have a small floorjack. Your neighbour or perhaps a friend will. As per the coil spring compressor,

They look like this. They are available pretty much everywhere automotive tools are sold. They are not terribly expensive and once you have it you'll always be prepared. If you can't afford one some automotive parts places lend or rent them. Or your neighbour or friend has one. You need this tool for this method.
We'll start this by removing both sets of hooks from the threaded part of the tool. We will only be using the lower, threaded hooks in this application, so set the hooks without the threads off to the side. Now drop the threaded shaft down through the upper shock hole in the top of the spring tower.

It'll look like this. Hard to see but I have 2 hardened thrust washers on the threaded shaft. Now, we drop in a quarter inch bolt about an inch or so long into the alignment hole in the shock tower.

Like so.
Now crawl under the car and lift the coil spring up into the pocket. Then while holding the spring upwards fish the compressor hooks up into the spring. I turn the threaded shaft with my fingers on one hand while holding up the spring with the other. Now. That sounds like a bit of a dance but it's really not all that difficult. Once you start to get the compressor threaded close to snug. Look up into the pocket. See your bolt hanging down? Rotate the spring until the end of the coil just bumps the bolt. Now back off about a quarter inch or so. Holding the spring in this position continue to thread the shaft of the compressor until its finger tight.
crawl back out from under the car. Put a socket on the compressor shaft up top and give it a couple turns. Just enough to hold the spring up tight.

Like this.
Back under car and once again look up into the tower and confirm your spring is properly located.

Looking up into the tower we see end of coil at about 6 o'clock in this photo and that alignment bolt just left of it. We can also see coil is in the pocket properly with just a tad of tension on it. Good.
Now we attach a ratchet strap to the spring. Experience has taught me the spring always wants to kick towards the outside of the car. So I connect the strap to the lower control arm mount on the opposite side, making certain the strap goes over, not under the lower control arm mount on the side I'm working on.


note location of strap on spring. Don't go to low or you won't get it back off later. Not low enough and it won't work. Strap pulls spring into position as well as acts as a safety strap keeping the spring from flying around the room. Also in above photo note the location of the spring compressor hooks.
Now with strap in place and given a few clicks to pull bottom of the spring towards center of the car about a half inch. Crawl back out. Back on top. Crank on that ratchet pull up that spring compressor until it starts to turn hard or you believe you have pulled it up enough. Keep looking underneath.
Next. Back on the floor. I drop the lower ball joint stud into the spindle and stick the nut on just about 3 or 4 turns. Then simply lift the control arm up aligning the control arm shaft with the rear bolt I left hanging in the hole.


now I just start the nut with one hand while holding the arm up with the other. Making certain that the spring is properly located in the lower pocket, adjust with ratchet strap if necessary. Now I position my little floor jack with a block of wood right under the shock mount area.


now slowly jack up the control arm and as the front of the shaft starts to get close you may need to pry on the arm one way or the other to get the bolts to line up. But it will pivot off the rear bolt so this is easy. Get that inboard bolt started first as above. The outboard bolt is just a bit harder to get on due to the arm being slightly in the way.

Then get that outboard bolt in.
The manual says to torque up these forward bolts first. Then the large rear bolt. Torque up the ball joint nut and install cotter pin

Look into pocket. Spring is properly located. Remove the compressor tool and that alignment bolt.
Now move on to shock install and tightening suspension bushings at ride height, etc.
but this is just about Coil spring install.
Very little effort was need by the jack to raise only the front section of the control arm just an inch or so.
All done by one person.
Hope this is helpful for all you DIY ers.

Last edited by 4-vettes; Aug 6, 2023 at 02:13 AM.
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