Join Date: Nov 2002
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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