Shelby drop...car is too low now. - Vintage Mustang Forums
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post #1 of 29 (permalink) Old 05-06-2019, 10:29 PM Thread Starter
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Shelby drop...car is too low now.

I've been rolling with 1" drop springs for well over a decade now with no problems. I recently changed my wheel and tire setup, got about 200+ miles with no issues. Last week I installed open tracker blue printed upper and lower control arms with roller perches, new coil insulators, larger sway bar and I did the shelby drop. My car now sits about an inch lower and rubs like crazy now when turning. I expected a little bit of drop, but not this much. I found some 1" thick coil insulators from NPD I am thinking about trying to get the ride height back. I assume I would need another alignment afterwards. Here are some pics of before and after.
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1967 Mustang, mild 351W, 750 Demon, MSD, Pertronix, long tubes, Dan williams built top loader with Hurst shifter, #550 coils, 5 leaf mid-eye springs, 3:55's, CSRP disc brakes.
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post #2 of 29 (permalink) Old 05-06-2019, 10:40 PM
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problem isn't the drop but the backspacing on your wheels more than likely

17x8x4.75 with 225/45/17(because Free) room for at least 235/45/17 maybe more


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post #3 of 29 (permalink) Old 05-06-2019, 10:54 PM
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Did you align the suspension after doing the Arning drop? If not that will give you positive camber while sitting and maybe not going negative. So if You didnít that needs to be done

Now that youíre running a bearing suspension that is going to kill spring rate big time. Ask me how I know
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post #4 of 29 (permalink) Old 05-07-2019, 12:47 AM
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I got John to drill his blueprint arm for a relocated spring perch ... did it for free.
It'll give you back the height you lost, a better motion ratio, and the ability to use lighter springs.
If you like the ride height, as 2nd 66 said, wheels with different backspacing, should fix it.
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post #5 of 29 (permalink) Old 05-07-2019, 04:13 AM
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A better solution then the 1" coil insulators is to simply use longer grade 8 bolts in the spring perch and use some quality washers to shim the spring perch up. Do not use more then 3/8" of washers. If you shim the Perch 1/4" you will increase the ride height 1/2".
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post #6 of 29 (permalink) Old 05-07-2019, 08:35 AM
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Originally Posted by cmefly View Post
A better solution then the 1" coil insulators is to simply use longer grade 8 bolts in the spring perch and use some quality washers to shim the spring perch up. Do not use more then 3/8" of washers. If you shim the Perch 1/4" you will increase the ride height 1/2".
Even better than standard washers, might be to run down to local tractor supply and look at selection of machine bushings. These are the heavy washer type bearings in machines and farm equipment. They are available in various thicknesses and sometimes you can use a couple of them vs a stack of regular washers.

https://www.tractorsupply.com/tsc/pr...5?cm_vc=-10005

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post #7 of 29 (permalink) Old 05-07-2019, 11:31 AM
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Quote:
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I got John to drill his blueprint arm for a relocated spring perch ... did it for free.
It'll give you back the height you lost, a better motion ratio, and the ability to use lighter springs.
If you like the ride height, as 2nd 66 said, wheels with different backspacing, should fix it.
While labor intensive ( you need to compress and remove the coil springs for access) John's method will restore some height ( almost 1/2" higher) . Specifically, you need to drill two new holes in each of the upper control arms for the spring perches one inch (1") outboard from the standard location. It is that simple and it works!

url]http://i87.photobucket.com/albums/k156/jefftepper/IMG_0027_edited-1.jpg[/url]

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post #8 of 29 (permalink) Old 05-07-2019, 11:50 AM
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Specifically, you need to drill two new holes in each of the upper control arms for the spring perches one inch (1") outboard from the standard location.

Is there a template available to do this mod?
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post #9 of 29 (permalink) Old 05-07-2019, 12:30 PM
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You could always swap your front springs out for the Eaton Improved Handling (GT) springs. That'll give you the height that you're looking for.
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post #10 of 29 (permalink) Old 05-07-2019, 12:41 PM
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The 1" drop shouldn't have lowered the car a full 1".
Ya, that wheel is really on the edge outward of offset. Do you use a spacer? You might be able to clear with a bit more -camber, don't fear the neg. camber since most of our tires are more likely to dry rot before wearing out.
For free and easy I did the perch move as well, measured about 5 ways from Sunday and got it good without a template. https://opentrackerracing.com/innovations I ended nearly 1:1 for out to up.

You know you've chopped enough from your springs when you can R&R them without a compressor

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post #11 of 29 (permalink) Old 05-07-2019, 02:22 PM
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Collar spacers also work nicely instead of washers if you can find the right bore size and thickness. Check you local hardware store.
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post #12 of 29 (permalink) Old 05-07-2019, 03:16 PM
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Is there a template available to do this mod?

https://opentrackerracing.com/produc...ve-1-template/

url]http://i87.photobucket.com/albums/k156/jefftepper/IMG_0027_edited-1.jpg[/url]

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post #13 of 29 (permalink) Old 05-07-2019, 03:53 PM
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A better solution then the 1" coil insulators is to simply use longer grade 8 bolts in the spring perch and use some quality washers to shim the spring perch up. Do not use more then 3/8" of washers. If you shim the Perch 1/4" you will increase the ride height 1/2".

How is that better than using a thicker insulator? Is it simply the adjustability? Or is there another reason?
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post #14 of 29 (permalink) Old 05-07-2019, 04:28 PM Thread Starter
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I did have the car aligned right after I did the work using the specifications I found on the forum. These tires weren't rubbing before the drop, I have a couple hundred miles on them and there are no spacers. Far as I can tell, the tires are only rubbing the front bottom corners of the fenders. I have ordered the collars as they were only $15, if that proves to be too much I will give the perch bushings or relocation a try. Removing my springs isn't very difficult, no compressor needed.
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1967 Mustang, mild 351W, 750 Demon, MSD, Pertronix, long tubes, Dan williams built top loader with Hurst shifter, #550 coils, 5 leaf mid-eye springs, 3:55's, CSRP disc brakes.
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post #15 of 29 (permalink) Old 05-07-2019, 06:39 PM
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How is that better than using a thicker insulator? Is it simply the adjustability? Or is there another reason?
You can fine tune the ride height with washers but the main reason I would never use the thicker insulators is they do not allow the coil spring to sit properly in the tabs at the top of the shock tower.
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