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Lowering 1971 convertible - how low?
#1
Good afternoon

I have searched these forums a great deal for the answer to my questions but not really found the answer.

I have a 1971 convertible and I would like to get it as low as possible without causing handling issues or interference. I really like the look of Luxstang's car!

How low can I go? Also what are your recommendations for the method of getting the car as low as possible.

After I get to the lowest point what size rims and tires can I run without body and frame modification?

Thank you for any assistance and happy holidays!
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#2
Welcome from Iowa. Lots of helpful people on here. I think Luxstang's vert is the lowest I have seen and looks awesome. Perhaps he can chime in but I seem to recall he used the 1" lowering springs in front then trimmed off some of the spring as well. Not sure what he did on the rear. I used some 1" lowering blocks on mine but I know you can purchase leaf springs from Detroit Eaton Spring with the eye location altered to get the lower ride height. Post up some pics when you get a chance.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#3
Edit,

I found his write up here.

http://www.7173mustangs.com/thread-my-ex...nt+springs

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#4
I think luxstang was lowered further so not sure when the various pictures were taken. Also I thought later a clearance issue with the ball joint and bump stop came up? So wondering what would be possible without such an issue.
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#5
Thank you for the quick response.

Here it is-

Original suspension; so it is pretty low already. When I upgrade the suspension I don't want it any higher and possibly lower.

updated with correct orientation


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#6
Wow! Thanks guys! Smile
Ok, straight from the source: front is pretty straightforward. I used the one inch shorter 620 lbs springs from Mustangs Unlimited. I don't know if they are exclusive to them but that's where I got them at the time.
Off those one complete turn has been cut off. That's as low as you can go without dropped spindles. It leaves about three milimeters before the upper control arm hits the bumper stop which then acts like progressive shock absorber. Smile
If you can use dropped spindles that's what I'd recommend for ride quality but I don't know if the extended suspension travel will cause the tires to rub.
In the rear I have one inch lowering blocks but I can't tell you what leaf springs I have. The ones the car came with when I bought it were sagging. I bought "stock height" springs to replace them and guess what? They were even lower. Not by much but a little.
Were my old springs not original? Were they higher? No idea.
Did the manufacturer mislabel the new ones or did the seller screw up? No idea either. I only know that the new springs did not raise the rear.

As for the damage I had in the front: I posted at the time that my ball joint broke as it looked like that had happened. Only later did I find your that the hub broke. That's something nobody had ever seen happening before. I posted that update somewhere at the time.....
The font disc has two wheel bearings, one inner and one outer. Now the whole thing broke so that the both wheel bearings stayed in place but the part that holds the wheel studs with the rest of the disc broke away from the "tube" the outer wheel bearing sits in. So the wheel wobbled and it looked like the ball joint had broken.
So that incident is not directly related to the lowering although it might have added something, I dunno, but it was probably a material defect.

For a while I used lower ratio tires on my 18 inch rims at the front which brought the car down even further. So it might look even lower in some pctures.
I have not ever ran into any issues with the lowering except a pretty bumpy ride. Unless you go wild or become careless with stuff that you have to drive over (think those fold down brackets that secure reserved parking spaces and such) you will probably not run into any obstacles.
Long tube headers might be tricky but they're a pita anyway, so.....

The handling is absolutely marvelous, it corners like its on rails, very little body roll. That's probably because the suspension has nowhere to go but basically sit on the rubber bumpers. It's not as hard as one might think. It seems those bumpers do compress and absorb a lot of energy.
That's it for now, it's 01:10 am and I'm signing off now. I'll be back for any further questions tomorrow. Smile

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#7
Luxstang

Thank you for the quick response.

So are you currently using 18" rims? And what size tires front and rear? Are the higher ratio tires a more reasonable ride?

Thank you

Z
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#8
My 18 inch rims have 285/40/18 on a 10x18 rim at the rear and 245/45/18 on a 9x18 rim at the front.
It used to be a 255/50/18 in the front with the mild lowering with no issues but after I lowered it further they rubbed slightly so I went to the 245/45.

Right now I have the original Magnum 500 on with 255/60/15 on all 4 rims. I put them on as my 18 inch front tires ran out of tread and I kinda liked the blacked out Magnums so they stayed on. Someone here once referred to it as the "get it done" look.
I'm not saying the 18 won't go back on. Depends on my mood.

As for the ratio: the higher 15 inch tires will absorb a lot of energy before it reaches the suspension so the ride is smoother. If you imagine a 18 inch low ratio tire they is about two inches high on a suspension that allows for about 3mm of travel you can imagine that your dental fillings will suffer after a while.
Ok, I've been to the U.S. numerous times and I know that your roads are in much better shape than ours so it should cause less of a problem.

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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