'66 GT sags to the left... - Ford Mustang Forum
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post #1 of 10 (permalink) Old 09-04-2019 Thread Starter
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'66 GT sags to the left...

New member and first time post. I just purchased a 1966 Mustang GT convertible (my first car was a used '66 GT when I was a senior in high school). I noticed that, when viewed from the rear, the car sags to the left. I measured the distance from the ground to the body (just in front of the rear wheel) and its a 1 inch difference. Not being a mechanic (other than the easy tune up type of stuff), I was wondering if this might be a leaf spring issue, a shock issue, or ???. I will likely take it in, but wanted to be semi informed before doing so....Thanks!


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post #2 of 10 (permalink) Old 09-04-2019
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Most likely both...………… but IMHO, find a good spring/suspension shop and have them re-arc the rear springs (hot- not cold) and they will be like new and stay that way for another 20 years...the fronts, just plan on replacing. If you have 1 or more springs that are "tired', chances are they are all about to go.....

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post #3 of 10 (permalink) Old 09-04-2019
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X2 on getting the rear springs re-arched. Tell them the stance you want and they will make it happen.
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post #4 of 10 (permalink) Old 09-05-2019
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Be aware that a front spring can have the same affect causing the whole side of the car to lean one way or the other. Its a lot easier, and cheaper, to replace the front springs so you might want to investigate those first before moving to the rear.

The body, even a convertible, should not flex by very much so if the left front corner doesn't have enough spring force to keep it level with the right front then the left rear corner will also be low. If the body is in bad enough shape that it CAN flex front to rear you have other more important problems to consider.

Unless your shocks have helper springs on then they will not affect how the car sits. Shocks only affect how the car moves up and down on the suspension. They do not provide any spring force to hold the car up. Even gas pressurized shocks only provide a few pounts of spring force which won't be enough to affect how the car sits on its springs.

You should be aware that a GT used different coil springs than the others. They were cut shorter which also makes the spring stiffer. For that reason a GT should sit about 1/2" lower. Ford had 6 different sets of coil springs for a '66 Mustang and no one today sells correct replacements. I started a thread here at AFM years about the springs but I never finished the project so have not posted any final solution. Read the thread, your car's spring situation sounds much like mine. Our GT now sits on a set of 8326 cut to almost the correct length but life got in the way and I haven't touched those springs to finish the project in nearly 3 years.

https://www.allfordmustangs.com/foru...gs-8326-a.html
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post #5 of 10 (permalink) Old 09-07-2019
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Shocks just dampen movement, springs support the cars weight, so if it's leaning, it's the springs not the shocks.
New springs are easy to get and replace and you can get the type you want. Re-arcing old ones isn't a good idea as the spacers are rotted away by now and the rust has taken a toll on integrity and the clamps are going to be suspect too.
A complete rebuild will fix some but not all of those issues and the cost will be about as much as a new set. Don't forget the bushings and u bolts while you're there.
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post #6 of 10 (permalink) Old 09-07-2019
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Re-arcing old ones isn't a good idea as the spacers are rotted away by now and the rust has taken a toll on integrity and the clamps are going to be suspect too.
When a shop re-arcs the springs they always (should) replace the clamps, etc. Mine were done by the infamous Hollywood Spring & Axle (Marv himself did mine)….after 6 months they settled to exactly what he said and have remained at the same ride height since 1986...….. the costs...… $80 for the pair (and I did the install myself )
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post #7 of 10 (permalink) Old 09-07-2019
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Its common practice to replace the clamps, isolators, and bushings. I usually take the whole car to the spring shop.
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post #8 of 10 (permalink) Old 09-08-2019
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Quote:
Originally Posted by Beechkid View Post
When a shop re-arcs the springs they always (should) replace the clamps, etc. Mine were done by the infamous Hollywood Spring & Axle (Marv himself did mine)….after 6 months they settled to exactly what he said and have remained at the same ride height since 1986...….. the costs...… $80 for the pair (and I did the install myself )
Of course, as I said some of those things can be addressed in the rearcing process, but the steel that has turned to rust can never be turned back into steel again. I found a pair of OEM springs for 97.14 online in a minute of searching. To me it's worth the 17 bucks to have brand new that have never had any of the surface removed from rusting. Just how I feel about it personally.

https://www.sdtrucksprings.com/leaf-...s/ford/mustang
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post #9 of 10 (permalink) Old 09-09-2019
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Of course, as I said some of those things can be addressed in the rearcing process, but the steel that has turned to rust can never be turned back into steel again. I found a pair of OEM springs for 97.14 online in a minute of searching. To me it's worth the 17 bucks to have brand new that have never had any of the surface removed from rusting. Just how I feel about it personally.

https://www.sdtrucksprings.com/leaf-...s/ford/mustang

If the springs are that bad, ok course!!!! but the spring shop really has to know where the new springs are mfg at...… IMHO avoid the imported staff!
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post #10 of 10 (permalink) Old 09-11-2019 Thread Starter
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Thanks, everyone, for the great advice. I definitely feel better about the next step, which is to find a 'spring shop' to take a look at things.
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