Side to side (body) movement in 4-link

At the risk of splitting hairs or falling down rabbit holes, if you have a 9/16" link bolt going through a 5/8" hole in a bracket, and that's the reason for your lateral movement, then (IMHO) the problem isn't that the hole is too big, it's that the nut isn't tight enough.

In a perfect world, the holes would be the correct size. But it's still a clamp joint.

What about bracket deflection? Particularly the uppers at the frame? If you don't have much triangulation in the links, it wouldn't take much deflection at the frame side to let the axle move a bunch. I'd start with the jam nuts and stuff, but it's an idea that nobody else has mentioned yet.

Shrug.
 
tkeaton said:
Is that the Artec truss?

Thoughts?

/thread hijack
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SOB, I wrote a whole response and somehow fuckered it up and now it's gone. The short of it was don't buy it in two pieces like I did. Just pony up and buy the whole system (truss and ram mount together). You can fit it better to your axle. Plus, all the support ribs are tied together along with the bridge that connects the two up top. I should have rotated everything back a little more so I could pull the steering up higher. However, with that being said I'm very pleased with the quality of it and would recommend it.
 
shawn said:
At the risk of splitting hairs or falling down rabbit holes, if you have a 9/16" link bolt going through a 5/8" hole in a bracket, and that's the reason for your lateral movement, then (IMHO) the problem isn't that the hole is too big, it's that the nut isn't tight enough.

In a perfect world, the holes would be the correct size. But it's still a clamp joint.

What about bracket deflection? Particularly the uppers at the frame? If you don't have much triangulation in the links, it wouldn't take much deflection at the frame side to let the axle move a bunch. I'd start with the jam nuts and stuff, but it's an idea that nobody else has mentioned yet.

Shrug.
Click to expand...
Not sure I'm following you but the link bolts are 5/8" in a 5/8" hole. The slop may be from Black Bear mentioned. I may need to throw a small washer in there to take up some space. I tightened them pretty good though but I'll just have to check. From my design I didn't think the triangulation looked that bad. Not bad enough to run a panhard.
 
Weld washers are your friend.
 
yeah but I would have to drill the hole out in the bracket then out these in. Otherwise, I'd have to run an even smaller bolt and get different misalignment spacers. I'll see if I can't just slip a 5/8" in there somewhere. That or torque the piss of the bolt to squeeze the bracket.
 
McCracken said:
Not sure I'm following you but the link bolts are 5/8" in a 5/8" hole. The slop may be from Black Bear mentioned. I may need to throw a small washer in there to take up some space. I tightened them pretty good though but I'll just have to check. From my design I didn't think the triangulation looked that bad. Not bad enough to run a panhard.
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How wide are your heims with the misalignment spacers and how wide are your control arm tabs?
 
Just pushed on a 3 year old buggy and one I'm building that does not even have jam nuts on the heims. No movement on either other than the tires flexing. You need to have someone pushing on it while you look to see where the movement is. Otherwise everyone guessing is just pissing in the wind.
 
I'm here at the shop and I just noticed one of the top link mounts measures 2 1/8" wide and the other 2". All others are 2" as well. So I know I've got to shim one of them.

So Black Bear it looks like ~2" (more like 1 7/8").
 
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Black Bear said:
1/8" of play in the joint / tab area it too much. shim that biotch up and go cut some doughnuts.
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Agreed

I've got a video I shot but I need to upload it to the you tubes first.
 
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