Lowering spring installation guestion - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 03-25-2019 Thread Starter
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Lowering spring installation guestion

Guys, I opted for only a 1Ē all around lowering spring set for my gt. I bought SR Performance springs. Does anyone know if I need to alter or replace the bump stops front or back. The instructional video on American Muscle does not say either way. Also is there a top or bottom to these springs? No instructions were included and the box was an open mess when they were delivered.


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post #2 of 13 (permalink) Old 03-26-2019
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The stop blocks would depend on the spring load weight. If they are just shorted than stock, you'd just hit the bottoming stops sooner on bumps. If they're shorter but have a heavier load weight, you'd have a stiffer ride but wouldn't hit the stops.

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post #3 of 13 (permalink) Old 03-26-2019
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On the S197 cars, the rear bump stops can be shortened a little by cutting them down, and there are no front bump stops. I assume the S550 is the same but I don't know for sure. For the S197, you can get special bump stops from FRPP which I'm pretty sure are actually softer but the same height as the stock ones; so it cushions that last inch of travel without hitting the stop real hard; and again I'm guessing you can do the same for the S550.

When you remove the old springs, you can compare the old ones to the new ones to figure out which is the top.

Not sure if it would be worth the effort to return the open-box mess or not . . .

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post #4 of 13 (permalink) Old 03-27-2019
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You may have to look up the instructions on line somewhere. Or call American muscle directly. Usually on the springs, the correct way to install is where you can read the name, in other words, the name of the spring is NOT upside down when you install them, if they have a name or logo on there. You can cut the stock bump stocks with a knife, the only thing is how much, so American Muscle can tell you if you need to. Chat online is easy with them on the website.
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post #5 of 13 (permalink) Old 03-28-2019 Thread Starter
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I contacted AM, they said cutting is not necessary and the springs have not top or bottom. Iíll compair with the originals and match them the best possible.

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post #6 of 13 (permalink) Old 03-28-2019
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Quote:
Originally Posted by Brain505 View Post
I contacted AM, they said cutting is not necessary and the springs have not top or bottom. Iíll compair with the originals and match them the best possible.
good to know.
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post #7 of 13 (permalink) Old 03-28-2019
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Even though it is not "necessary" to trim the bump stops, I think you might want to do it anyway. This will provide a little more room for downward travel of the suspension; if you don't, you will probably hit the bump stops more often, which can be fairly harsh.

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post #8 of 13 (permalink) Old 04-01-2019
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i have used the same springs from amer. mus. on my 2014 and 2017 . no xtra work to be done. i put them on,and had no issues both times. yes was only a 1 inch drop.

Lowering spring installation guestion-0503170558.jpg

Lowering spring installation guestion-img_20190117_155601923.jpg

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post #9 of 13 (permalink) Old 04-04-2019
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You’re not gonna need to modify your bump stops at all. works just fine. I have about the same amount of drop and I have no problems I never hit my bump stops. I wasn’t sure if it would be enough drop for me but it turned out awesome

Did you get caster camber plates or bolts for the front and back?
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post #10 of 13 (permalink) Old 04-19-2019 Thread Starter
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Just an update. Got the installation done, it was quite a chore. The fronts were simple. but on a convertible the rears were a ***** as you need to first remove the X brace then proceed as normal. I didnt realize that fact till i had everything undone as per a hardtop install. Had to do it all up, remove the brace and start over.

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Quote:
Originally Posted by Brain505 View Post
Just an update. Got the installation done, it was quite a chore. The fronts were simple. but on a convertible the rears were a ***** as you need to first remove the X brace then proceed as normal. I didnt realize that fact till i had everything undone as per a hardtop install. Had to do it all up, remove the brace and start over.
Post some pictures


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post #12 of 13 (permalink) Old 04-21-2019 Thread Starter
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thats a lot of work for an old guy. This is day one on the ground. I think they will settle some once i put a few hundred mile on them.
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Looks good! I opted for BMR performance springs 1.2 front and 0.5 rear.
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