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Replacement Coil Springs for 72 Javelin
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CamJam View Drop Down
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Points: 6548 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CamJam Quote  Post ReplyReply Direct Link To This Post Topic: Replacement Coil Springs for 72 Javelin
    Posted: Aug/06/2017 at 4:43pm

My '72 Javelin 304 sits very low in the front, so I want to replace the coil springs when I'm rebuilding the front-end.

Moog lists the 3112 as the correct spring for the car, but I'm considering the 3156. Anyone had any experience with these two springs?  The original springs seem very soft, but they're old and tired too, so maybe new springs of the original type is all I need?  I'd like to improve the handling but don't want to destroy the ride either.  

I just ordered some KYB gas-adjust shocks too, so maybe that will be enough? The shocks on the car now might be the originals for all I know!

Any opinions or advice welcomed.  Thanks!



3112		Inner
Diameter
5.02		Bar
Diameter
0.69		Installed
Height
9.5		Load
(lbs.)
1591		Spring
Rate
306.6		Free
Height
14.38		End
Types
TP
31185.020.699.51789306.615.38TP
31565.020.699.51690311.214.92TP


Edited by CamJam - Aug/06/2017 at 4:46pm
'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST
'69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD
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Points: 9082 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 5:07pm
There is a standard rate, a v8 with ps and ac, and HD rate.

I assume the one you are looking at is the v8 with ps and ac.

I had that spring type on my 73 and think my 71 as well.

I think it is a good all around spring rate.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Points: 6548 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CamJam Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 5:19pm
Yes, forgot to mention that my car has A/C and PS. Near as I can gather 3156 seems to be the same rate as the A/C spring, though Moog makes no mention of it in the document I was looking at.  Is the 3156 the one you had on your car?

I also see the Moog spring below mentioned in an older thread as being a good choice for the '70 AMX to reduce the nose-high attitude.  Not sure it's going to work for my '72 as it's already too low, but it is another option for us.  

Perhaps I should start by measuring the length of the springs that are on the car now and comparing them with the numbers above. 

31485.020.669.38141025914.75TP


Edited by CamJam - Aug/06/2017 at 5:27pm
'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST
'69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD
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I'll leave the part number questions to the pros... as far as I know there are open questions about springs of recent. Most are happy with Eaton Detroit Spring.

I should have saved my original 71 front springs, as both front and rears were perfect height and stiffness. No body I seen wanted used factory springs, as new was their best option back then, and now. I kept my rears for customising work, that is my last section to complete once done with front end.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Points: 6548 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CamJam Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 5:43pm

Not sure if it's correct, but I read somewhere that Eaton Detroit only makes leaf springs, not coils.
'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST
'69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD
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Points: 9082 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 5:55pm
Originally posted by CamJam CamJam wrote:




Not sure if it's correct, but I read somewhere that Eaton Detroit only makes leaf springs, not coils.


Ah, i have not checked... Though keep on hearing them being the go to choice for some time now, and assumed they would have coils.

I got mine long ago from NAPA, and not sure if they have the same options as when i made my purchase in 2003 or so.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Points: 6548 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CamJam Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 7:06pm

Here's a useful link:

Stock Coil Spring Specs
'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST
'69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD
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Points: 412 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shannock Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 7:35pm
This is great info guys! I'll be rebuilding the front end of my Javelin soon and it's great to find this information so readily available.
Thanks, Tom
Tom Davies
Rhode Island
1971 Javelin SST
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Originally posted by CamJam CamJam wrote:


Here's a useful link:

Stock Coil Spring Specs


That's some link... I think my HD springs are 401 equivalent 1700 or so.

The 3156 would be what both of my 304 AC automatics had as an equivalent.

Th 3118 would be a wee more stiffer as it is for the 360.

If performance is your needs the 3118 would fit for engine torque and handling.

It will take a few days of good driving to settle the springs as new installation will be a wee taller than stock.

You could compress them over a few nights if you choose, before checking height if wanting to speed up the process.

Also new spring donuts will keep about +.5000" high until they squeeze down after time.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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CamJam View Drop Down
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Joined: Jan/04/2014
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Points: 6548 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CamJam Quote  Post ReplyReply Direct Link To This Post Posted: Aug/06/2017 at 9:25pm
Looks like the 3118 is no longer available. Unhappy

Autozone has the 3156 for $95 per pair.  RockAuto is about $25 cheaper, but freight eats most of that up.

Autozone lists the 3156 as fitting 1970 V8 Javelins and Rebel, 71-74 Matador, and various Gremlins, Concords and Hornets.  Also a Chevy 1 ton pick-up!
'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST
'69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD
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