Coil Spring Replacement

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cr_bobcat
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Coil Spring Replacement

Post #1 by cr_bobcat » Tue Jun 13, 2017 9:22 am

So I found out where my mysterious squeak is coming from. Both the upper and lower ball joints are shot. I've sourced all the components to replace the front steering/suspension. Through liberal use of RockAuto and ebay I've managed to score strut rod bushings, upper control arms, lower control arms, sway bar, sway bar bushings, end links, tie rods, tie rod sleeves, idler arm, front shocks, and rear shocks all for around $600. I plan on doing the Arning drop on the suspension while I have it all apart.

My question is whether or not I should be ordering new coil springs. I've found 2 different Moog part numbers for the '67 Mustang but they have different spring rates: 269 lb and 283 lb. The heavier spring is roughly 1/4" longer than the lighter. What would you guys recommend?
Block: Stock C8 Block/pistons, C9-M head, 1.75/1.5 valves, dual spring, 1.65 RAU Rockers, port divider, direct mount Holley 4412-500, HEI w/20* advance, manifold vac, dual-out Arvinode exhaust, Clay Smith 264/274 110* installed w/ 4* advance, adjustable dual chain timing, C4 w/ shift kit, 3.20 (TBC) rear ratio, 9.44 SCR / 7.97 DCR

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bubba22349
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Re: Coil Spring Replacement

Post #2 by bubba22349 » Tue Jun 13, 2017 5:13 pm

cr_bobcat wrote:I plan on doing the Arning drop on the suspension while I have it all apart.

My question is whether or not I should be ordering new coil springs. I've found 2 different Moog part numbers for the '67 Mustang but they have different spring rates: 269 lb and 283 lb. The heavier spring is roughly 1/4" longer than the lighter. What would you guys recommend?


:beer: That's an excellent plan going with the Arning drop, togeather with all of your new front suspension parts it should make for an excellent Driver! One other thing you might consider is doing the mod to convert the lower coil spring / shock mounts (Rockers) into Roller Bearings too (See below link). :thumbup: As far as the coil springs go how do you like the ride and handling of your car as it is now? In many cases it's a good idea to replace them and the new ones are going to be stiffer then your old ones, however it's not always nessisary. Does the car sit up good and about the same height on both sides? You will know more also after you get the springs out you can place them side by side to see if they are still same height. Measure the springs wire diameter and compare it to those new ones that will get you into the ball park as to the spring rate you have now then you can decide if you want to go stiffer too. If your old springs are still in good condistion you could also cut up to a coil off to drop it about an inch and stiffen them up a little. The heavier and longer spring maybe a V8 spring. The 1965 & 1966 GT V8 springs are a decent up grade too, just remember that the 200 is about 85 or so pounds lighter than a 289 / 302 V8 and a 250 six is almost the same weight as the SBF V8. Does your car have a front sway bar on it? Good luck :nod:

The Roller Spring Mount Mod
http://www.fordmuscle.com/archives/2005 ... /index.php
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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B RON CO
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Re: Coil Spring Replacement

Post #3 by B RON CO » Tue Jun 13, 2017 8:07 pm

Hi, X2. The lighter spring is probably the 6 cylinder spring. I would measure the ride height from say each wheel well or pinch weld, front and rear, and write it down, to see where you are before you take it apart. Hopefully the measurement is the same on each side. Then you can see what you did after the work is done. Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

bmbm40
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Re: Coil Spring Replacement

Post #4 by bmbm40 » Tue Jun 13, 2017 8:58 pm

Roller bearing spring mount is a good idea, I would definately do that.
66 Bronco-1970 250, NV3550, DSII, 4 turn ps, uncut, 1" bl, 2.5" sl, front disc, twin stick D 20, 30 x 9.50
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