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11-05-2017, 02:40 PM | #1 |
Registered User
Join Date: Dec 2005
Location: PA
Posts: 27
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Lowering springs, where did I go wrong?
I have a 2004 Mach 1. I wanted about a 1" drop, nothing drastic. I did my research, so I thought, and decided on the Ford Performance M-5300-C springs.
According to several websites the estimated drop for 99-04 mustangs is 1-1/8" in front. I found reviews that said on a Mach 1 the drop was about 1". Perfect! I just completed installing the BBK caster camber plates with the BBK isolators and the M-5300-C springs, fronts only. I am only seeing about 1/2" drop. I'd be happy with a 3/4" drop but, only 1/2". What did I miss? I am hesitant to install the rears because I don't want the rear end to be lower than the front.
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04 Mach 1, MT, IUP |
11-05-2017, 03:10 PM | #2 |
Moderating at Mach 1
Join Date: Aug 2002
Location: Baton Rouge, La.
Posts: 16,271
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Re: Lowering springs, where did I go wrong?
The Mach 1s were lower than GTs from the factory, so non-Mach 1 figures wouldn't apply.
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Krewe de la Mach Rouge #340804 13th Mach 1 built 11/07/02 Build Date 12/13/02 Delivery |
11-05-2017, 04:11 PM | #3 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
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Re: Lowering springs, where did I go wrong?
Are the bbk isolators thicker than stock? Are you sure the pigtails of the springs are seated correctly?
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
11-05-2017, 04:33 PM | #4 |
Can't be bridled
Join Date: Sep 2007
Location: Texas
Posts: 7,006
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Re: Lowering springs, where did I go wrong?
You used poly urethane isolators. They're thicker than factory rubber and also don't compress at all. Put the factory isolators in and it ought to come down some.
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2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁 |
11-05-2017, 05:15 PM | #5 |
Registered User
Join Date: Dec 2005
Location: PA
Posts: 27
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Re: Lowering springs, where did I go wrong?
Thanks for the options. I'll make sure everything is seated correctly. My oem isolators are in still in good shape I'll try them also.
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04 Mach 1, MT, IUP |
11-05-2017, 06:08 PM | #6 |
finally paid for
Join Date: Nov 2004
Location: Ypsilanti Twp, Mi
Posts: 4,077
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Re: Lowering springs, where did I go wrong?
yeah...for sure use the factory iso's...
I used the same springs before i changed to coilovers
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2004 mach 1-turbo build in progress.. Fast xfi 2.0 OLD combo- 826rwhp/720 trq -100 shot NX 9.13@154 on 100 shot NEW- in progress... |
11-06-2017, 02:56 PM | #7 |
SVT
Join Date: Jun 2010
Location: Northern California
Posts: 812
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Re: Lowering springs, where did I go wrong?
Really? C springs and poly iso's.. lol why even bother..
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2001 Zinc yellow SVT Cobra Forged 11.5CR 284ci Comp 106500 cams - Degreed 01 cobra Heads - tastefully modded Roys ported/polished Intake Kooks longtubes, Magnaflow catback D&D T3650, Mgw shifted FTB Goodies, 4.30s, FRPP diff cover, 31 splined IRS 04 cobra interior , black termy seats, Speedhut gauges Tubular K, MM coilovers/ Koni SA yellows Starkweather tuned, 24* timing on 91 octane 11.7 @ 117mph 1.62 60ft. Raceweight 3200lbs Next up:Sullivan intake and hat, self tuning.. |
11-09-2017, 08:44 PM | #8 |
Registered User
Join Date: Feb 2016
Location: Theodore Alabama
Posts: 282
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Re: Lowering springs, where did I go wrong?
Falcon is right. I contacted Volgland when I was considering them and they confirmed most drop spring numbers are 1/2 inch less when it comes to the Mach since its already that much lower then the GT it will also work on. I ended up cutting 3/4 coil out of the front and sportlined the rear.
Last edited by 03Shadow Grey; 11-09-2017 at 08:44 PM. Reason: spelling |
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