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Old 01-01-2018, 04:46 PM
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Rattle after spring lift

Anyone up for "guess this sound over the internet"?

I just finished installing the TF 2.5" spring lift without shocks, TF shock extension brackets, and Rancho Geo Correction brackets.

Love the stance, love the ride, but I have a small rattle in the right rear corner. I've gone over every bolt twice, even removed everything and reinstalled. I've tried "re-indexing" the right rear spring, double-checked that the top isolator is there (it is). It shows up on sharp down travel most, and sounds very much like something is loose. With the wife driving, I rode in the cargo area to see if I could more closely isolate where it was coming from, and it basically went away with my weight in the back. I am about to swap shocks from side to side, but after that I'm out of ideas.

I'm looking for the random solution here, like has anyone had to reroute or secure the e-brake cables after removing the wire guide, or has anyone had trouble with clearances? Does that spring retainer washer on the bottom ever cause any unwanted noises if the spring is rotated one way or another?
I've checked/re-checked/re-re-checked the Control arm bolts, shock bolts, shock extension bolts, Sway bar end link bolts, and Track bar bolts. Even took video with my GoPro just to see if I could spot anything moving (nope).

The only "non-standard" thing I can think of is that I used the middle hole for the track arm relocation bracket on the drivers side. The flag nut was dangerously close to to interfering with the spring compression in the top location. I plan on addressing that at some point, but figured I'd bring it up *just in case* that was relevant (not thinking so).

I found one old thread with a guy having the same problem, but no resolution listed... hoping I've missed something somewhere easy!

Thanks in advance,
Chris

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Old 01-01-2018, 05:29 PM   #2
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Are you sure it's from down below? Endgates are funny critters for making clunks..

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Old 01-01-2018, 05:42 PM
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Quote:
Originally Posted by BeyondYourFrontDoor View Post
Are you sure it's from down below? Endgates are funny critters for making clunks..
I would say "very sure", but honestly if I was I would've tracked it down by now I guess. It is very much sync'd up with suspension travel and very much sounds like it's coming from the spring/shock area of the passenger rear.

Having my weight in the cargo area deadened it/nearly stopped it, so I feel like it has to be suspension related.

Thanks for the suggestion, I will take a closer look.
Chris
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Old 01-01-2018, 06:03 PM
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GoPro video of the rattle...

https://youtu.be/sdXW0RN-1aQ
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Old 01-01-2018, 07:09 PM   #5
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I had a similar problem like this on a lowered truck. Thought I could save some money reusing my shocks with relocation brackets. The shocks didn't like running in the new range and made one heck of a noise. Off the truck the shocks were smooth and didn't seem worn at all. I replaced the shocks and the noise is gone. I could hear the noise by jumping up and down on the bumper while my son searched underneath for the source of the noise.

Since everybody like pictures, here is the truck.
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Trailhead Customs bumpers and tire carrier
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Old 01-01-2018, 07:13 PM   #6
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Posted the above before I saw your video. Your noise does sound like something is loose, almost sounds tinny like a heat shield or skid plate?
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2007 2 Door X 6MT LT315 70 R17 Duratracs
2.5 Teraflex lift w/ shocks. Teraflex diff covers
4:56 Gears Truetrac front, Eaton E Locker rear
Trailhead Customs bumpers and tire carrier
Warn HS9500 winch
Don't let fear and common sense get in your way.
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Old 01-02-2018, 12:21 AM   #7
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I have the same issue. It’s my evap canister rattling.
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Old 01-02-2018, 12:01 PM
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Quote:
Originally Posted by Kennuck View Post
Thought I could save some money reusing my shocks with relocation brackets. The shocks didn't like running in the new range and made one heck of a noise. Off the truck the shocks were smooth and didn't seem worn at all. I replaced the shocks and the noise is gone. I could hear the noise by jumping up and down on the bumper while my son searched underneath for the source of the noise.

Since everybody like pictures, here is the truck.
Sweet truck! I can't replicate the noise at all. It only happens at lower speeds, below 45mph or so and is definitely related to suspension travel. I'm suspecting the shock at this point simply because there isn't much left to check. That said, because it does seem to be speed dependent, I'm not sure. Less suspension travel at higher speeds?

Thanks for the help,
Chris
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Old 01-02-2018, 12:07 PM
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Quote:
Originally Posted by Kennuck View Post
Posted the above before I saw your video. Your noise does sound like something is loose, almost sounds tinny like a heat shield or skid plate?
Now watching the video I realize you nailed the description, it does sound tinny on the video. That said, in real life, it's much more of a "thunk". In the cab it sounds like a wrench hitting the tub back near the right rear. In fact, that was my first suspicion, that I left a box end wrench on the inside of an Upper Control Arm bolt while tightening it.

I will double-check the heat shield regardless, I haven't yet so who knows!

Thanks again,
Chris
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Old 01-02-2018, 12:08 PM
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Originally Posted by ohnoitsbrandon View Post
I have the same issue. It’s my evap canister rattling.
Thanks Brandon, I'll take a look at that when I crawl under there again later tonight.

Chris
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Old 01-02-2018, 08:15 PM   #11
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Quote:
Originally Posted by camack7827 View Post
Now watching the video I realize you nailed the description, it does sound tinny on the video. That said, in real life, it's much more of a "thunk". In the cab it sounds like a wrench hitting the tub back near the right rear. In fact, that was my first suspicion, that I left a box end wrench on the inside of an Upper Control Arm bolt while tightening it.

I will double-check the heat shield regardless, I haven't yet so who knows!

Thanks again,
Chris
If it is actually more of a clunk it may then be your shocks as I described.
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2007 2 Door X 6MT LT315 70 R17 Duratracs
2.5 Teraflex lift w/ shocks. Teraflex diff covers
4:56 Gears Truetrac front, Eaton E Locker rear
Trailhead Customs bumpers and tire carrier
Warn HS9500 winch
Don't let fear and common sense get in your way.
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Old 01-05-2018, 10:31 PM
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I just replaced the rear shocks and removed the Teraflex extension brackets and put some Rancho 5000s in... still have the "thunk". I also examined/pushed/pulled on the Evap canister which didn't budge a bit.

Definitely suspension related, only happens at lower speeds and with the Jeep empty. With the family in it, or 100 lbs of salt over the rear axle, the thunk is definitely reduced/gone.

Does that coil spring have to be indexed in any particular way? The isolater is there on top, but the rears don't seem to have any spot to index the coil on the top or bottom.

Hoping this turns out to be something stupid...
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Old 01-06-2018, 01:06 AM   #13
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Usually you want the pig tails on the bottom to face the rear of the Jeep.

Also check that the factory jack is not loose...
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Old 01-07-2018, 08:40 PM
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Usually you want the pig tails on the bottom to face the rear of the Jeep.

Also check that the factory jack is not loose...
Checked the jack, all seems good there. I'll orient the rear springs at some point later this week (after it warms up a bit up here in the NE).

Thanks,
Chris
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Old 01-11-2018, 09:03 AM
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I finally figured out my culprit... long story short, it was the bumper.

Long story version:
  • I purchased and installed a Barricade Extreme HD Bumper from Extreme Terrain's eBay store (used to sell returned parts, parts used in photo shoots, etc. It was brand new, but did not include all of the bolts, block off plates etc. It did include a bag of parts, but not all go to this bumper. I recieved twice as many bolts as needed for example.
  • I installed the bumper a few days before the lift, and did NOT have any noise issues with it for 3 days. I did have a clearancing issue with the rear cargo door though.
  • While instaling the lift, I loosed the bolts, adjusted the bumper, retightened the bolts, and promplty forgot I had done so.
  • Taking the Jeep out for it's first test drive after the lift, I heard a "thunk" and associated it to the lift.
  • After taking that right rear apart 3 or 4 times, looking for loose things listed above, I finally came to the conclusion that it had to be a situation where the body mount on the rear of the frame rail was moving a bit over bumps, causing a momentary gap between the horizontal bumper surface and the vertical body support. I went to mey "extras" bag of parts, and found two small rubber u shaped "bumpers".... light bulb goes off.

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Quick test drive with this guy installed, no more thunk. I'm going to install the other side, re-level/clearance the bumper, and forget this last week of troubleshooting ever existed. Thanks to all that made suggestions, your posts made me look away from the shock, spring, control arms, sway bar links. I was convinced that is where the problem was (seemed to be related to suspension travel).

Can't wait to go actually enjoy driving this thing with the lift, that thunk was like nails on a chalkboard for me!

Chris

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