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Advanced Fabrication and Engineering For when your build is going off the charts. Wildly modified vehicles and straight up buggies welcome.

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  #1  
Old December 2nd, 2007, 17:31
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Knuckle rotation contemplation

Let's talk hypothetics........say someone with a HP D30 wanted to rotate the knuckles to reclaim the caster loss associated with a 6" lift. He wants to run unit bearings so the hub vs ub arguement is not applicable, nor it the 30 vs 44 vs 60 discussion.

This yet to be named individual could make sure the subject axle housing was straight and level, then document the angle of knuckle to pinion and angle of knuckle to tube.

Once the knuckle/tube welds were cut to allow the knuckle to be removed, couldn't one simply heat the knuckle up to reduce the friction between knuckle and tube and rotate the knuckle to the newly determined, appropriate caster angle?

I'd like some feedback from those with actual experience.
TIA
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  #2  
Old December 2nd, 2007, 17:45
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Re: Knuckle rotation contemplation

Heat really isn't needed, just the use of a big hammer. Cut the inner C free and bang away.





















Then again, what do I know? All my mods are bolt-ons...
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  #3  
Old December 2nd, 2007, 18:19
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Re: Knuckle rotation contemplation

said endevor may be avoided by said party purchasing offset balljoints.
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  #4  
Old December 2nd, 2007, 21:33
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Re: Knuckle rotation contemplation

Just remember to rotate your spring mounts too.
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  #5  
Old December 2nd, 2007, 22:01
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by Jes
Heat really isn't needed, just the use of a big hammer. Cut the inner C free and bang away.

Then again, what do I know? All my mods are bolt-ons...
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  #6  
Old December 2nd, 2007, 22:08
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by TNT
Just remember to rotate your spring mounts too.
Hmmmmm. With the pinion pointed straight at the t-case, there is no noticable bow in the coils, so please explain this recommendation?
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Old December 2nd, 2007, 22:12
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Re: Knuckle rotation contemplation

And you just built that killer D30 too...I like your build, and soon I will start on mine, and that is an issue that I am thinking about too. Is your caster out that much?

Justin
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  #8  
Old December 2nd, 2007, 22:16
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by XJEEPER
Once the knuckle/tube welds were cut to allow the knuckle to be removed, couldn't one simply heat the knuckle up to reduce the friction between knuckle and tube and rotate the knuckle to the newly determined, appropriate caster angle?

I'd like some feedback from those with actual experience.
TIA
I've done it to a 60 knuckle and a 44 knuckle... I would just make sure I ground those welds real well... I wouldn't want to pound on those 30 C's too hard.
Billy
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  #9  
Old December 3rd, 2007, 00:30
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Re: Knuckle rotation contemplation

Just did this exact thing today. Worked fine. I added 4 degrees.
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  #10  
Old December 3rd, 2007, 01:22
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by XJEEPER
Hmmmmm. With the pinion pointed straight at the t-case, there is no noticable bow in the coils, so please explain this recommendation?

With the 4 degree turn I did on a buddy's XJ the bumpstop pads angled forward 5 degrees with the caster set at 6.5 degrees. I had to cut a slit in the mount from the back of it going forward and weld the slit shut after the gap was closed with a BFH.

If you rotate the axle forward the spring pads rotate forward too.
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  #11  
Old December 3rd, 2007, 18:56
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Re: Knuckle rotation contemplation

Castor is overrated.

In a hypothetical situation, I wouldn't mess with it.

Hypothetically, if a person would let go of the steering wheel while turning a corner, would the wheel tend to come back to center on it's own?
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  #12  
Old December 3rd, 2007, 20:26
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by xjjeeper19
And you just built that killer D30 too...I like your build, and soon I will start on mine, and that is an issue that I am thinking about too. Is your caster out that much?

Justin
What? We're talking about Jeff? I thought it was a "yet to be named individual?"
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  #13  
Old December 3rd, 2007, 22:16
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by Goatman
Castor is overrated.

In a hypothetical situation, I wouldn't mess with it.

Hypothetically, if a person would let go of the steering wheel while turning a corner, would the wheel tend to come back to center on it's own?
Perhaps....considering this for another D30 project.
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  #14  
Old December 4th, 2007, 07:28
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by Goatman
Castor is overrated.

In a hypothetical situation, I wouldn't mess with it.

Hypothetically, if a person would let go of the steering wheel while turning a corner, would the wheel tend to come back to center on it's own?
If I was running a 44 or 60 with hubs it woudn't worry me that much but I can see where Jeff is going with this and its something I am thinking about a lot with my new build.

Without hubs the caster becomes much more critical, not so much for the actuall caster issue but the issue of driveline angle. In fact you can get, on a 5-6 inch lift great caster and still keep your springs in line. However that always spinning driveshaft becomes a problem on a jeep you want to drive everyday.
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  #15  
Old December 4th, 2007, 08:46
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Re: Knuckle rotation contemplation

Quote:
Originally Posted by DrMoab
If I was running a 44 or 60 with hubs it woudn't worry me that much but I can see where Jeff is going with this and its something I am thinking about a lot with my new build.

Without hubs the caster becomes much more critical, not so much for the actuall caster issue but the issue of driveline angle. In fact you can get, on a 5-6 inch lift great caster and still keep your springs in line. However that always spinning driveshaft becomes a problem on a jeep you want to drive everyday.
That was the issue I had. To keep my junk drivable on the highway the front driveshaft was in a very poor alignment and the vibrations were horrable. It was compounded by the fact that I have a manual transmission with an AtlasII which makes the front shaft really short(27").
Removing the front driveshaft to drive it on the road got old very quickly, especially when you're laying under your junk in a wind storm in Barstow while snow melts off your rig and drips all over you.
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