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post #1 of (permalink) Old 12-01-2003, 11:41 PM Thread Starter
 
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YJ with SR caster problems, how to correct?

OK, those of you out there with toy axles, YJ springs, and shackle reversals, how did you manage your caster angle?

I've installed the AAPA SR kit for YJ springs and the caster angle is way off, like 13 degrees positive (leaning back). Check the attached pix for reference.

As I see it, there are three reasonable ways to go about correcting it:

1) Move the rear shackle hanger higher. It now bolts into the stock zuk hanger which is way low. Replace it with a lower profile standard shackle hanger.

2) Move the front fixed hanger lower. This could be done by extending the hanger downward, aka 'fangs'.

3) Combinations of spring shims and cut/turned knuckles.

Options 1 and 2 above are not difficult but each does not produce a very significant effect. If I move the rear shackle hanger up 2", it only changes the caster by the arc-tangent of (2"/45") or about 2.5 degrees. Not much change when the stock caster for a toy axle is 3 to 4 degrees.

Options 3 is not as desireable since the toy axle does not take to shims very well since the passenger side perch is up on the diff. Cut/turn maybe but I would need to find a professional to do it, more $$.

BTW, for reference, the front fixed spring eye is 28" from the ground. The rear shackle end spring eye is 19" from the ground.

I know you guys with this toy/YJ/SR setup are out there. How high from the ground are your spring eyes? What's your caster angle?

A front SR setup with toy axles/YJ springs is not as easy as I thought it would be! [img]images/graemlins/thud.gif[/img]

-Paul in Fort Collins, Colorado
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File Type: jpg 1224935-front sr setup.JPG (75.4 KB, 95 views)
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post #2 of (permalink) Old 12-01-2003, 11:43 PM Thread Starter
 
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Re: YJ with SR caster problems, how to correct?

Here is a picture of the shackle hanger that is way to low.
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File Type: jpg 1224937-front shackle.JPG (68.6 KB, 68 views)
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post #3 of (permalink) Old 12-02-2003, 06:41 AM
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Re: YJ with SR caster problems, how to correct?

Trail rig so I realy didnt care but the problem is compounded,, if you just rotate the knuckle you Hi-stear will be cutting it close to clear the springs. You may have to do a combination of things to correct the issue lower the front raise the rear and possably turn the knuckle some. i think a 4 deg shim is all you can get in there on the pass side before U-bolts are a problem...
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post #4 of (permalink) Old 12-02-2003, 08:55 AM
 
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Re: YJ with SR caster problems, how to correct?

Do you have or plan power steering? if so:

The good: add a 2-4 deg shim and leave it. then the castor will be apropriate for the job. power needs
more castor to give road feedback. Otherwise if the rear end starts sliding you lose all feedback to the
wheel and cant feel where the fromt wheels are.

The bad: you won't have optimal pinion/driveshaft angles, and the pinion will be even lower.
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post #5 of (permalink) Old 12-02-2003, 09:05 AM
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Re: YJ with SR caster problems, how to correct?

SORRY - I do not mean to hijack this post.....

</font><blockquote><font class="small">In reply to:</font><hr />
power needs more castor to give road feedback

[/ QUOTE ]

How much caster would you recommend dialing in for Samurai axles with P/S? TIA!
post #6 of (permalink) Old 12-02-2003, 09:29 AM Thread Starter
 
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Re: YJ with SR caster problems, how to correct?

Outlaw,

Yes, I'm planning on power steering with 35's. Stock steering is too difficult to turn on the rocks.

Are you saying just go with the 3 degree shim and no other change? This would give me about a 10 degree positive caster angle. Is this what you recommend?

I see what you're saying about PS needing more caster for feedback, but the toy truck I got all the parts from had PS and a factory caster angle of 4 degrees positive.

This is not a daily driver project and will be towed for trails more than a couple hours away. Still, for driving to local trails, I would like it to be safe and handle decent on the road.

Thanks for your help!

-Paul

[img]images/graemlins/RockOn.gif[/img]
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post #7 of (permalink) Old 12-02-2003, 09:38 AM
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Re: YJ with SR caster problems, how to correct?

</font><blockquote><font class="small">In reply to:</font><hr />
Replace it with a lower profile standard shackle hanger.


[/ QUOTE ]

Dont replace it, drill new holes as high as you can, and forward a 1/2" or so.
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post #8 of (permalink) Old 12-02-2003, 10:18 AM Thread Starter
 
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Re: YJ with SR caster problems, how to correct?

Doug,

Yes, that was my first thought too, but if I replace the stock hanger with these:

http://www.jcwhitney.com/webapp/wcs/...;storeId=10101

I can move the hanger up even higher. Also, the AAPA shackle does not fit the stock hanger or spring very well. On the top its too narrow and I had to squeeze the hanger ears together. On the bottom spring side its also too narrow and I had to grind 1/8" off the spring eye bushings to get it together.

Paul
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post #9 of (permalink) Old 12-02-2003, 10:31 AM
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Re: YJ with SR caster problems, how to correct?

</font><blockquote><font class="small">In reply to:</font><hr />
I've installed the AAPA SR kit for YJ springs and the caster angle is way off,

[/ QUOTE ]

On the CSC, er, AAPA kit? I don't believe it. [img]images/graemlins/smirk.gif[/img]
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post #10 of (permalink) Old 12-02-2003, 11:03 AM
 
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Re: YJ with SR caster problems, how to correct?

Damn, I'm glad I got the Trail Tough front YJ kit, the castor is way better. I didn't realize the spring sat at such a angle with the SR kit.
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