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View Full Version : control arm grinding- how much is enough?


nakman
04-27-2008, 02:22 PM
I've got a pretty good clunk when I hit bumps (same as Matt), how much do I take off the top of the control arm? Just the center strip? or dig into the meat of the arm a little? This is tough stuff, to grind, btw.. :o

Inukshuk
04-27-2008, 02:39 PM
Don't hit bumps - duh! :)

powderpig
04-27-2008, 04:27 PM
You can go about 1/8-3/16 but not much more in MHO. Good luck with this. Robbie

Hulk
04-28-2008, 08:16 AM
Did you disconnect the tie rod to get to the top of the control arm?

nakman
04-28-2008, 08:17 AM
Ok well I left the DS about like in the picture above, but I've taken the passenger side down until I've got one flat plane all the way across the top. Two other steps inbetween still yielded clunking, I did the last pass last night and haven't tested it yet.

Also I learned something- I didn't have to take the tie rod off (drag link?) after all, if you just turn the wheel then put the side you want to grind downhill you can sneak in with the grinder upside down.. shoot there's an hour I wish I had back.

If I still get clunking, I'm temped to pop the PS end of that tie rod off again then stick a washer in there and reassemble.. bad idea?

nakman
04-28-2008, 08:20 AM
Did you disconnect the tie rod to get to the top of the control arm?

I did, also removed the swaybar drops then lifted it up and out of the way, and realized later I didn't need to do either one. Just flex the front a little and you can sneak in on the downhill side..

powderpig
04-28-2008, 08:24 AM
Bad idea, as the hole is tapered and will then not seat well(washer under the TRE).

Are you sure it is not just the TRE's flopping(when they loosen up some, not worn out they will flop from front to back causing a clunk) that is causing the clunk? Put some grease on the arm and turn the steering wheel back and forth and see where the grease is rubbed off. This is where you need to grind if needed.

nakman
04-28-2008, 08:46 AM
Ok, thanks Robbie.. I'll scrap the washer idea. I'm hoping my clunk is just the tie rod flopping from one side to the other, courtesy of the control arm.. is that correct? Yes it's annoying, but as long as I'm not putting a bunch of load on the TRE or worse, those bottom 4 bolts on the knuckle, then I'm going to worry about it a little less.

I will likely be tossing the grinder & an extension cord into the truck for Moab, in case I need to take it down some more.

nakman
04-29-2008, 09:38 PM
Matt I'm down this far on the PS now and I still have a clunk. I'm going to shoot for about twice as deep tomorrow and hope that does it.. how far did you go?

Hulk
04-29-2008, 10:20 PM
I haven't done any grinding yet. It only clunks when I go through a big dip. I may do some grinding in the morning -- or I may throw everything in the truck and drive to Moab. I'm leaning towards the latter choice.

Beater
04-30-2008, 08:10 AM
um, panhard rod bushings? I always found that to be the source of the larger travel clunk, both front and rear..

Uncle Ben
04-30-2008, 09:18 AM
I haven't done any grinding yet. It only clunks when I go through a big dip. I may do some grinding in the morning -- or I may throw everything in the truck and drive to Moab. I'm leaning towards the latter choice.

Matt,
I believe you still have the stock tie rod, correct? Nak has the Slee link so it is larger in diameter. I still have the stock tie rod also for the same reason. I have both Marlink's but just never got ambitious enough to making the TR fit the stock arms with plates. :rolleyes: I've thought about breaking the bank and going for Christo's gorgeous billet control arms but I decided I would rather spend the money on a Diamond housing so I can run a Land Cruiser front diff and get the mini truck crap outta there.

Hulk
04-30-2008, 10:09 AM
Matt,
I believe you still have the stock tie rod, correct?

That's correct. That's a good point -- I'm probably smacking the control arms less than Tim is, given the narrower rod. I probably will grind the tops of the control arms a bit, but not today. I'm going to finish up some work, pack up my gear and hit the road to Moab in a few hours.

powderpig
04-30-2008, 11:34 AM
About the only time you should be hitting the control arm is when you turn. if you are hearing a clunk when you are driving down the road you have different issue, even if you hit a dip or rut. I did not think of this until later. So unless you are turning when you are hearing the klunk, you need to grind more. later robbie

nakman
05-06-2008, 09:43 PM
I still have some clunks, and am pretty sure it's not the tie rod hitting the control arm. Happens any time I compress the springs a lot or in a hurry, wheels straight, or not. Like I described to some of you in Moab, it sounds like a big log hitting the underside of a metal boat. Would those springs be twisting at all as they compress? Any lube I can put on there?

what if I were to cut up a bike tube then sleeve the ends of the spring.. hmmm..

Beater
05-06-2008, 09:53 PM
humor me... check the tightness of the panhard bushings, axle side. also, maybe pull them, look at the rubber lamination/cracking..

j

sleeoffroad
05-07-2008, 07:31 AM
Tim., did you install the front bumpstop drops inside the springs. If so, check that the lip on the metal cup that holds the rubber bump stop if not contacting the spring. This can happen if you use the caster plates since the springs are a little curved.

nakman
05-07-2008, 08:24 AM
John I couldn't budge those front panhard bolts.. they're tight. And it's more than just one side, it's actually all 4 corners but it's worse in front. Plus Matt has the same issue, and he put a new panhard rod on in front.

I'll check out the bump stops, thanks Christo I know what you're talking about as I thought the one side seemed really close to the spring going back in, Mike actually commented on that too. How would I bend that over to the center though? doesn't seem possible.. :confused:

Convert
05-07-2008, 08:46 AM
Did you reuse the control arm bolts? The FSM shows them has a non reusable item. That is how I correct my clunk after the lift

nakman
05-07-2008, 09:19 AM
I reused the back ones, but the lower ones are all new since they had to be longer to make it through the Slee plates. There also more of them now, down by the axle (3 per side).