'73 Dart Sport 340 H Code leaf spring replacement recommendation

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TRWRacing

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Back end starting to sag due to age. 6 leaf springs

What vendor/type? Thanks!

Looking to raise the back about 1-2" over stock nothing more. Don't want the back end real high.

Tires:
14" Rallye Wheels
Front: 215/70 R14
Rear: 235/60 R14

IMG_8329.JPG
 
TRWRacing said:
Back end starting to sag due to age. 6 leaf springs

What vendor/type? Thanks!

Looking to raise the back about 1-2" over stock nothing more. Don't want the back end real high.

Tires:
14" Rallye Wheels
Front: 215/70 R14
Rear: 235/60 R14

View attachment 1715142058
Click to expand...

I agree with Rocco. What makes you think the springs have sagged?

I will tell you I have the same car (which is really a 1973 Demon that Chrysler called the Dart Sport, caving in to religious nuts) and the bushing that goes into the front of the spring is a queer diameter. I never did find out why I had a different size. I was told all the 73 340 cars had them. Calvert, Competition Engineering and a third source I can't think of said that was BS. I know mine was wrong, as I had to make my own front eye bushings.

That was a FWIW heads up.

Also, I know some of the aftermarket springs are coming with a higher spring rate than what the factory had. And I don't mean aftermarket springs like Calvert.

Just know you could run into some weird issues.
 
Check Mancini racing, I have their Extra heavy duty ones on my duster, and they sit it up in the rear.
I actually had to add a 1" block because it sat too high.
 
sireland67 said:
Check Mancini racing, I have their Extra heavy duty ones on my duster, and they sit it up in the rear.
I actually had to add a 1" block because it sat too high.
Click to expand...
Yellow rose, 73 up may have had a larger bolt for the front hanger.
I believe Mopar Performance springs use the larger bolt even when
used in 63-66 applications.
 
Lee Robinson said:
Yellow rose, 73 up may have had a larger bolt for the front hanger.
I believe Mopar Performance springs use the larger bolt even when
used in 63-66 applications.
Click to expand...


What about the OD of the front eye bushing??? IIRC (I'd have to look it up on the webs) the part number is the same for 67-75 A body. I have a queer size. Calvert had no idea. They wanted $125.00 to machine two bushing I made in an hour.
 
yellow rose said:
What about the OD of the front eye bushing??? IIRC (I'd have to look it up on the webs) the part number is the same for 67-75 A body. I have a queer size. Calvert had no idea. They wanted $125.00 to machine two bushing I made in an hour.
Click to expand...
I have run across A body spring hangers with a smaller or a larger bolt. I would think that the diameter of the
bolt hole in the bushing and the size of the eye in the spring would be the only thing relevant to the bushing.
Sounds like a weird problem. One would think that the spring would accept a stock busing or a proprietary bushing
in an aftermarket spring.
 
Lee Robinson said:
I have run across A body spring hangers with a smaller or a larger bolt. I would think that the diameter of the
bolt hole in the bushing and the size of the eye in the spring would be the only thing relevant to the bushing.
Sounds like a weird problem. One would think that the spring would accept a stock busing or a proprietary bushing
in an aftermarket spring.
Click to expand...


I wrote down the dimensions of my bushing somewhere. The bushing that Competition Engineering was, IIRC .100 smaller in diameter. I always get the weird crap.
 
Call espo. Great customer service and I’ve had great experiences with their springs. Buy their xhd (6 leaf) v8 springs. Can get them in stock, +1” and +2” heights.
 
Photo from today sitting in the garage from the back side view seems to sag.

Looking for the stance of my first car ‘71 Demon 318

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98ABC179-A6AD-4839-B6C8-78650C17AB13.jpeg


744C21B3-12F1-421E-9A23-B8DBDB92D22D.jpeg


0A3D9BAE-EAA2-4786-870C-0ABB53EBA529.jpeg


3B15F527-739B-456E-A2BF-8C8296563C49.jpeg
 
TRWRacing said:
Photo from today sitting in the garage from the back side view seems to sag.

Looking for the stance of my first car ‘71 Demon 318

View attachment 1715142093

View attachment 1715142094

View attachment 1715142095

View attachment 1715142096

View attachment 1715142097
Click to expand...


personally i think it looks great the way it is.. how about a 15" rim and a taller tire? may give you the height ya want.. i wouldn't go any more then a +1" spring on the car..

235/60-14 is like 25" tall.... a 225/70-15 is a hair over 27' tall... theres an inch in height right there..
 
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Exploring my options. I have a deep 727?trans pan from Mancini that hit bottom once stepping very slow from my driveway to street cause it’s a low curb. Not a normal driveway graidient low angle. I have a new Mopat Performance pan for the spring to but on that’s not as deep as the Mancini one.

Just that that there virtually no arch to the springs and they appear to be original that time replace to restore the height.

The 15” rear rim and new tires is an option.

Thanks!
Eric
 
I have a dart sport with cheap dynomax coated headers. Also had 14 rallys. Drivers header always was hitting @ driveway, manholes. So went to 15x6 front & 15x8 rear rallys rear. Front tire 215/65/15 rear tire 275/60/15. My rear leafs were arcked down!! So bought some new mopar performance springs. All good now!!
 
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