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Old 09-29-2017, 09:03 PM
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Bad_S55 Bad_S55 is offline
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Join Date: Dec 2014
Location: Saint Clair Shores, Michigan
Age: 20
Posts: 727
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A quick word about rear springs: if you're going to convert, just get springs from '07-'14 Mustangs. I use '11-'14 GT springs and couldn't be happier. They cost me $20, were basically brand new, and had a 3/4" drop over my stock Grand Marquis springs. Any air bag replacement springs will also sit way too high.

Now for a rear coilover setup: it is actually possible and has been done, HOWEVER, the guy who did it, his Crown Vic is a road race only car. He uses a coilover rear shock in place of the stock rear shock with a modified upper mount and no springs sitting between the axle & frame.

2005 Mercury S55

Saleen Series II Supercharger
Zack big brake kit with engraved S55 calipers
Full Stainless Works 3" exhaust system
Addco front & rear sway bars
Cut Marauder Springs with KYB Shocks
Spherical sway bar links
3.55 gears, trac-lok, and 31 spline axles
Tuned by Lidio at Alternative Auto
LX Sport/Marauder hybrid interior
LEDs inside & out
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