Leaf spring load numbers

I believe the XHD springs sold today are re-pops of the Hemi spring.

I got my XHD's where I wanted them in an E by adding one full length leaf. They seem to match well with 1" T bars.

I know in the offroad world, thinner leaves and more of them will flex more. Tim

I don't understand what is the "load capacity" rating represents.

That is NOT the spring rate in LBS/IN. Factory rear springs are 100-140 lbs/in range.

Sometimes in the facotry sales books they list rear leaf spring ratings. There are some leaf spring rates in the old edition Direct Connection books. I know the A-body rates are in there.

Came from..
http://www.stengelbros.com/DodgeCarLeafSprings.htm

It looks like part numbers for Triangle Spring, a manufacturer. However other manufactuers may use a similar p/n system. Triangle sells through retail spring shops, eg. Jenson & Mitchell in North Jersey. As of a few years ago, Springs & Things was mail order retailer for Triangle.

edit: question answered! Thanks!

Stengel's list for a-bodies doesn't turn up the Triangle p/n for the springs I used (78-709 or the less arched version 78-609). Either its a different mfc or partial listing. It is certainly a helpful listing!
For the springs that are available on-line, they also include the OEM p/n that it replaces. So with a bit of research you can cross reference to a Chrysler-Plymouth or Dodge parts book.

For example (a-body sorry I didn't copy all the other ones down when I was at the dealer).
Stengel Bros p/n 78-581 replaces OEM 2808677 and 2835056.
2808-677 was for 383 equiped Darts and Barracudas 1967 - 1969. HD 383s only at least in '68-9
It used main leaf p/n 2808 688 unique to the 2808 677 spring packs. Thicker? Different Arch? I don't know but would like to find out.

Further, the DC Chassis Rally Prep chapter notes 2808-677 has a wheel rate of 130 #/inch and no increase in lift.
Finally, the shop manuals indicate these cars should have 6 leaf rear springs, left and right same.

I don't have any notes on the 2835056. However by 1969, new leaf spring p/n were coming on line starting with 3004. It might be a '68 only part number.

Abridged summation from the chassis manual;

Spring rate is the amount of force it takes to compress the leaf pack one inch.

Load rate is the amount of weight it takes to hold the leaf pack in a flat position.

Control rate is the ratio of stiffness in the front segement compared to the rear segment. 1 means the front is as stiff as the rear. Production rates range from 1 to 1.4. SS rates range 1.4 to 1.8.

I got a little more info about spring rates.

I was trying to compare the rate of the Hotchkiss rear springs, at 160 lb/in, they sounded pretty stiff, but I had no comparison. This is what I came up with.
FYI Hotchkis T-bars say they are 200 lb/in. @ 1.03" diameter.

Here are the Torsion bar spring rates

And... to the list for 41" B and E-bodies, the 1.24" dia TB can be added at 425 lbs/in (I run these in my autocross T/A)... along with 225 lbs/in fiberglass mono-leafs having an uncompressd 5" arch (leaving about 1.5" uncompressed arch in race-trim).

Digging up an old thread. I found that the numbers on my 68 Dart GSS 440 car are 2835056 and I found a set of springs in my stash that have the number 2835064 that look identical, does anyone know what these springs fit?

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hi,the 6 leaf 2835064 fits 68-69 a body 340 cars. the main leaf on your 2835056 is different than the 2835064 main leaf. look at the front spring eye for different bushing dia. ,ronnie

2835056
2835064

Neither of those numbers show in the numerical index of the '68 parts book.
Maybe someone more knowledgable about original parts and assemblies can can explain.

The closest items in the same to a 68 Dart GSS 440 is the
L2-S, 383 eng .....2808 677

Hmm. I don't know at what ratio does it becomes a practical solid link and the direct relationship of a control rate to roll rate issue. I'd certainly think that at higher control ratios you are altering which section(s) of the spring yields first to various loading conditions.

That, and possibly the physical limitations of shaping a leaf or pack of leaves that are so biased toward the axle forward.