ZJ LP30 pinion angle questions - JeepForum.com
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post #1 of 5 Old 03-20-2009, 03:49 PM Thread Starter
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ZJ LP30 pinion angle questions

I'm playing around with my control arm lengths today and darn near eliminated all vibrations by pointing the front pinion parallel with the driveshaft. It seems to steer ok but what is the right thing to do? Do I point the pinion parallel with the driveshaft or slightly down and if so how much?

Will this angle cause lubrication problems?
My front trackbar appears to be rubbing at the diff end a bit, does this matter?

I'm at 4.5 inches running the 249 with a u-joint front driveshaft.

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post #2 of 5 Old 03-20-2009, 04:18 PM
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They say that pinion angle is more important than caster, but at 4.5" with the pinion turned up that much, you probably don't have much caster at all. How do the coils look from the side, are they bowed/arced too much? Pointing the pinion parrallel with the DS is okay when you have a double carden at the other end. What size tires are you running? I'd be surprised to find that you're able to run 33's or larger without death wobble in your current setup.

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post #3 of 5 Old 03-20-2009, 04:28 PM Thread Starter
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The coils are somewhat bowed from the side, is this OK? I am on 33's and I have yet to ever experience this infamous death wobble but from what I hear, I don't want to. I do have the double carden at the tc end as well. So will I have lubrication problems if I run it this way? If I should lower the pinion a bit, how much in relation to the driveshaft?
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post #4 of 5 Old 03-20-2009, 05:29 PM Thread Starter
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Anyone else have any opinions on this
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post #5 of 5 Old 03-20-2009, 06:07 PM
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It shouldn't cause you any issues. If you haven't noticed any handling issues since you adjusted them I would leave them as is. Sometimes lack of castor can cause issues with handling like the steering not returning to center or wandering.
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