Another leaf spring shackle angle suspension question

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Another leaf spring shackle angle suspension question

Postby Pixie Susan » Sun Apr 10, 2016 8:04 am

I've read the info on here and other forums regarding the shackle angle when mounting leaf springs, but much of it seems ambiguous when it comes down to "what should I do". So here's what I've got.

I have a home built TD on a HF frame. The original owner fabricated a drop axle and took the slipper springs off leaving me with a super cool looking ride that is anything but smooth on bumpy roads. I'm replacing the axle with a 2000# Northern Tool round axle with leaf springs rated at 1500#/pair. My setup is about 950#. I run 195/75 R 14's. I don't do any off-roading with it but it's making its way to the desert/mountains in Arizona and Utah, amongst others.

I'm ready to finish putting everything together my next day off. The only big question I have is about the shackle angle under no load when I mount the rear hanger. What would be ideal given my specs?

Any pros want to lend their knowledge to this little lady?

Thanks in advance!


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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Sun Apr 10, 2016 8:09 am

It may be worth mentioning I tow this with a 1st gen Scion xB, which has done wonderful thus far.


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Re: Another leaf spring shackle angle suspension question

Postby Redneck Teepee » Sun Apr 10, 2016 9:58 am

Image

This chart above will show you all you need to know. Your shackle bottom leaning slightly (just past 90deg.) forward will soften your spring rate.



Image

This is a pic of my spring angle and it rides pretty smooth for a 1400 pound teardrop. Not to worry though... any position within 90 degrees off the datum line 10 to 15 degrees either way will work just fine.

Good Luck! :thumbsup: :thumbsup: :thumbsup:
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Re: Another leaf spring shackle angle suspension question

Postby Kaz » Sun Apr 10, 2016 1:47 pm

Wish I found that explanation and pic when I was building mine. Mine is slightly to the rear and it rides ok.I was shooting for slightly forward but the tape measure was upside down :lol: I assume the set up is for an unloaded suspension, Does it make a difference ?
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Re: Another leaf spring shackle angle suspension question

Postby Redneck Teepee » Sun Apr 10, 2016 2:32 pm

Kaz wrote:Wish I found that explanation and pic when I was building mine. Mine is slightly to the rear and it rides ok.I was shooting for slightly forward but the tape measure was upside down :lol: I assume the set up is for an unloaded suspension, Does it make a difference ?

The springs on an unloaded small trailer (Teardrop) won't compress too much, if any, when you flip it over onto it's axle as long as the springs are correctly sized for the application and completed build weight range.....So yes set it up unloaded.

Hope I was helpful :)
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Re: Another leaf spring shackle angle suspension question

Postby dales133 » Sun Apr 10, 2016 4:43 pm

Mine are angled back about 10 deg as i was advised but i havnt had a decent tow yet

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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Sun Apr 10, 2016 8:32 pm

Those who aren't thrilled with the way your trailer rides...why? Too bouncy?


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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Mon Apr 11, 2016 11:36 am

dales133 wrote:Mine are angled back about 10 deg as i was advised but i havnt had a decent tow yet

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How is it riding?
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Re: Another leaf spring shackle angle suspension question

Postby dales133 » Mon Apr 11, 2016 11:43 am

Ill tell you in a few days i hope.
Ive just added shocks to but ive got the cabin off so i expect it to be pretty firm but hopefuly little boynce

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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Mon Apr 11, 2016 2:48 pm

dales133 wrote:Ill tell you in a few days i hope.
Ive just added shocks to but ive got the cabin off so i expect it to be pretty firm but hopefuly little boynce

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Good for you! I contemplated taking the cabin off mine for about 2 seconds before opting for rolling around on the floor. Image
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Another leaf spring shackle angle suspension question

Postby Pixie Susan » Thu Apr 14, 2016 9:44 pm

Any of you folks mount shock absorbers with your leaf spring setup? If so, did you buy a mounting kit or fab one?


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Re: Another leaf spring shackle angle suspension question

Postby dales133 » Thu Apr 14, 2016 10:11 pm

I got a monting kit for mine but had to alter the top mounts and weld them to the frame.
The bottom mounts bolt onto the spring ubolts .
Same as these.
https://www.couplemate.com.au/trailer-p ... absorbers/

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Re: Another leaf spring shackle angle suspension question

Postby KCStudly » Fri Apr 15, 2016 11:23 am

I used parts store shock studs... special shouldered bolt/studs that prevent over tightening the shock bushing... and built the mounts for them.
Here's how I did it: http://www.tnttt.com/viewtopic.php?p=931777#p931777.
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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Sun Apr 17, 2016 10:13 pm

KCStudly wrote:I used parts store shock studs... special shouldered bolt/studs that prevent over tightening the shock bushing... and built the mounts for them.
Here's how I did it: http://www.tnttt.com/viewtopic.php?p=931777#p931777.


Nicely done!
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Re: Another leaf spring shackle angle suspension question

Postby Pixie Susan » Sun Apr 17, 2016 10:14 pm

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Finished her up yesterday!


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