Rear end knock after Ironman lift
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- Start date
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How often? Well I torn them up pretty good in 3 months time with out the extension etc but then I'm harder than most on take-offs etc
No need to disconnect to install lift
I triple checked these and they look mint. Tried moving them around with a prybar and they seem to hold really well.
Nope I still have no idea what's causing this. I am waiting for the weather around here to get warmer before digging deeper into this.
OK the weather got better and I finally got to it.
It's definitely the shocks. I removed them and no more knocking. I put back the factory ones and no knocking again. Both of the Ironman ones though result in knocking. They fit snug. I can feel no play and they are firmly clamped in between the mounting points on the chassis. I put a shovel under the tire and have my dad rock the handle while I am under the truck. Then I can hear the knock (it's much, much louder inside though) and with each knock I feel a vibration in the shock. I can't feel any play of the shock with respect to the chassis though.
It's hard to believe the shocks themselves are shot. They've been doing this since brand new and I barely have 15000 mostly road miles on them. Besides there's much more knocking on the passenger side no matter which of the two shocks I install there. So it's gotta be something with the shock mounts or the bolts or something like that but I am really clueless at this point. I am gonna measure how the Ironman shocks dimensions compare to the OEM ones trying to find where some play might come from.
It's definitely the shocks. I removed them and no more knocking. I put back the factory ones and no knocking again. Both of the Ironman ones though result in knocking. They fit snug. I can feel no play and they are firmly clamped in between the mounting points on the chassis. I put a shovel under the tire and have my dad rock the handle while I am under the truck. Then I can hear the knock (it's much, much louder inside though) and with each knock I feel a vibration in the shock. I can't feel any play of the shock with respect to the chassis though.
It's hard to believe the shocks themselves are shot. They've been doing this since brand new and I barely have 15000 mostly road miles on them. Besides there's much more knocking on the passenger side no matter which of the two shocks I install there. So it's gotta be something with the shock mounts or the bolts or something like that but I am really clueless at this point. I am gonna measure how the Ironman shocks dimensions compare to the OEM ones trying to find where some play might come from.
i removed both ironman shocks last week and the noise also went away. Less than 5000 miles on mine and they have done it since first installed. They compress well just pushing with my own weight....much better than the OE ones that were on there. :shrug:
Well just measured Ironman and OEM shocks and there is virtually no difference in any dimension. So that cannot really explain any play.
The only thing that comes to mind is defective shocks. Both of them as weird as it might be.
krisP do you have the longer than stock Ironman shocks or do you have the stock length ones? Mine are stock length.
The only thing that comes to mind is defective shocks. Both of them as weird as it might be.
krisP do you have the longer than stock Ironman shocks or do you have the stock length ones? Mine are stock length.
tthompson442
New Member
I have the same knocking. The dealer removed the IronMan shocks and the noise ceased. I took the shocks off and could see bolt thread marks on the inside of the upper shock eyelettes. I think there is just enough play between the eyelette and the bolt to cause the knocking. I'm working on a aluminum sleeve to put in the eyelette to tighten up the clearance. I'll let you know if that works.
noticed the same thing yesterday,threads left a mark at the top of the eyelet
the shock should not have any thread marks since it should be shouldered all the way through where the the bushing sits
Never had or seen that issue before
Never had or seen that issue before
Play in the upper shock mount was my initial thought, too. But the upper shock eyelettes of the Ironman shocks are exactly the same diameter as the OEM shocks ones. Moreover, the OEM shocks had exactly the same thread marks.
The difference between the bolt diameter and the eyelette diameter was 0.2mm on both stock and Ironman. In theory that could cause knocking but why isn't it there on stock?
The difference between the bolt diameter and the eyelette diameter was 0.2mm on both stock and Ironman. In theory that could cause knocking but why isn't it there on stock?
I doubt that. Ironman, OME and the aftermarket manufacturers offer no different shocks for 07s.
Nope all the same, even the KKs take the same shock
any update from anyone? Tried new upper shock mount bolts and trying to sleeve the bolt with no success. Really stumped. Newer LCA, New rear UCA, no brake lines catching , not tailgate, or shock mounts. My only other guess is the UCA hitting its mount from up and down motion when hitting bumps/pot holes because of the sharper angle from the lift. Or we all have defective ironman shocks
If at only 2.75 inches highly doubt that it is the tri-link hitting, I've ran at 4 inches and never had a sound from mine
Remove rear shocks and drive ( very cautiously ) down a close by road to see what you hear
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