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Wide tires
#1
I have a 71 Mach 1 that had been in the family for years.  My dad had always run air shocks to jack the rear end up.  I put new leaf springs and coil over shocks.  Still needs something to stop the wider tires from hitting the back quarters.  Looking in to bigger bump stops.  The leaf springs have about 12 inches of travel and those last couple aren't really needed.  Eventually I plan to go with subframe connectors and other expensive upgrades to drag race and some autocross, but for now just trying to get the tires to not rub.  Thought about going back to the original look with the same size tires front and back, but with 545 HP I'm not sure that is really an option.  Let me know your thoughts.  Thank you!
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#2
These cars are not designed for air shocks or coil over shocks, as the sheet metal on the top of the shocks are not reinforced and often crack with air shocks. Your true solution is to get rid of tires that are too wide for the design limits of the 7123's.

Let me check your shorts!
http://midlifeharness.com

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[Image: oldfart.png]
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#3
You could put in some longer spring shackles or try and find some springs with more arch, or have yours re-arched .

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
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#4
How wide are your tires? What wheel size and backspacing?

I would suggest you search the forum and see what sizes of wheels and tires other members have been able to run without clearance problems.

Also, please go to Introductions and introduce yourself and your car. Be forewarned, we like pictures of your car.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
You could get some rims with proper backspacing so they don't hit the wheel lips....


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#6
Thanks for the replies, I tried adding pictures earlier and the file was too big. I'll try again later.
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#7
[Image: IMG_20181002_204828456_2.jpg]
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#8
runninpony 
Welcome from Omaha!

71-73 Mustangs never die, they just go faster!
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#9
You can go here and play around with the tires sizes in the spreadsheet to get an idea of what different tire sizes has on your car.
https://www.7173mustangs.com/thread-tire...#pid115406



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#10
I started out with a set of Cragar S/Ss 15x10s in the rear.  Off the shelf, they came with 4 1/4" back spacing.  I later went through Summit Racing and ordered a set of 15x10 Cragar S/Ss with custom backspacing of 5 1/4" - no more issues.  The tires are 295/50R15s.

With the old wheels:
[Image: attachment.php?aid=40188]

With the new wheels:
[Image: Frankcarshow_2017-4.jpg]

Here's the difference:
old:
[Image: attachment.php?aid=38593]
[Image: attachment.php?aid=38592]

New:
[Image: attachment.php?aid=38595]
[Image: attachment.php?aid=38594]

The only sucky part is that you'll need to find someone who can use the 4 1/4" backspacing rims on their car to sell 'em to.

Hope this helps.

Eric

[Image: mach1sig2.gif]
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