HEAVY DUTY front springs - Vintage Mustang Forums

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post #1 of 4 (permalink) Old 05-28-2002, 09:01 PM Thread Starter
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Well I got my Canadian Mustang sourced 620 front springs in and they are STOUT. Even with both arms, the strut rods and the 1" sway bar installed the upper arms are STILL down as far as they can go, resting on the pinch weld of the frame rail. I've got the car supported on jack stands and the sprindles are so low to the ground that installing a wheel/tire will not be possible right now. Is this normal with new HD springs? I supppose I could place a floor jack under the lower arm to compress the suspension to get the tire on, but will my Mustang's nose be pointed toward the stratosphere? Maybe it'll "settle down" after I take it out for a drive.... but yikes. Any similar experiences/advice/reassurance? TIA.

BTW the car has a pro-motorsports negative wedge installed.

65 Fastback 289 4spd, 3.40 Traction Loc, Granadas, Flaming River QR box, Pro Motorsports neg wedge kit and springs, VIntage 45's, 225/50/16 SP8000s, I NEED A NEW DOOR!
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post #2 of 4 (permalink) Old 05-28-2002, 09:32 PM
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I have almost the same setup. When I installed my 620's I could do it without the spring compressor. The springs were that much shorter then the stock ones. Are you sure the spring is seated all the way?



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post #3 of 4 (permalink) Old 05-28-2002, 10:28 PM
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I have the 620s (although they were from Branda) on the Fastback and there was little or no spring compression necessary to install them. In fact, I used the extra thick insulators to maintain some ride height and wouldn't want the front end any lower.

66 Fastback Restomod (342 stroker, T5 12.8 @ 112 mph)
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post #4 of 4 (permalink) Old 05-29-2002, 01:47 AM
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On my 70' I had to use spring compressor to install. It rode at almost the same height as the stock spring because the stock spring would compress more under the weight of the car. It didn't raise the front up like that though. Maybe your old springs were weak. You should have about two are three fingers of space above stock tires to the fenderlip. I cut 1 1/2 inch off of mine to lower the front to what you see below. I need beefier shocks now.

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