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Topic Review (Newest First)
03-29-2007 11:21 PM
ResQguy After driving it around for a while and letting it vibrate, a bunch of the helo mechs at work took a look at it. It looks like the cat convertor is vibrating pretty badly. So, no big deal...I was about to slap on a new system anyway. Thanks for all the input guys.
03-29-2007 11:19 PM
ResQguy
Quote:
Originally Posted by Triple88a View Post
you drop the tranny/transfer case skid to lessen the angle from the driveshaft. With 4" of suspension lift you get quite of an angle which causes vibrations.. I think RC kits come with brackets but i thought i might ask
Yeah, we dropped the transfer case.
03-29-2007 08:54 PM
Triple88a yeah i just saw he said he installed the drop bars
03-29-2007 08:07 PM
mrbigjeep
Quote:
Originally Posted by Triple88a View Post
tranny drop?
it doesn't sound like a driveline vibe. but the roughcountry 4" lift does come with one
03-29-2007 07:55 PM
Joes
Quote:
Originally Posted by ResQguy View Post
Just got back from the grocery store. Ok, it doesn't do it as soon as I put it into "D" and take off. It takes a few minutes before the noise begins. Also, it sounds less like marbles in a can and more like a Huey helicopter from a Vietnam movie, haha. Oh, and it's definitely coming from the front somewhere...forward of the dash area and underneath. Any thoughts?
IF it sounds like a Helo from Nam i'll buy it from U..
03-29-2007 07:15 PM
Triple88a you drop the tranny/transfer case skid to lessen the angle from the driveshaft. With 4" of suspension lift you get quite of an angle which causes vibrations.. I think RC kits come with brackets but i thought i might ask
03-29-2007 06:44 PM
ResQguy
Quote:
Originally Posted by Triple88a View Post
tranny drop?
Huh?
03-29-2007 06:14 PM
Triple88a tranny drop?
03-29-2007 05:40 PM
ResQguy
Quote:
Originally Posted by Joe Dirt View Post
If you didn't adjust the transfer case shifter linkage after installing the transfer case drop, it might be the transfer case shift fork rubbing. Adjust it soon or it will wear through.
If that were the case, wouldn't it rub right off the bat rather than waiting 5 minutes or so into the drive to start rubbing? Also, don't know if I mentioned this...it doesn't do it in reverse, only in drive. Weird...
03-29-2007 04:00 PM
Joe Dirt If you didn't adjust the transfer case shifter linkage after installing the transfer case drop, it might be the transfer case shift fork rubbing. Adjust it soon or it will wear through.
03-29-2007 01:07 PM
ResQguy
Quote:
Originally Posted by jp'rs_peep'rs View Post
Check the exhaust system over.
Check out your install again.
Check the t-case shift linky.

C.
While I was out, I made sure I was able to smoothly shift into 4H and 4L...no problems there. Also, I visually inspected the linkage...everything looked cool. My roommate and I gave the new lift a good once-over yesterday and didn't notice anything out of the ordinary. The exhaust, however, could use some work. I'm thinking that, because it takes a few minutes to start making the noise, that the exhaust system needs to heat up before it starts clunking.
03-29-2007 01:03 PM
jp'rs_peep'rs Check the exhaust system over.
Check out your install again.
Check the t-case shift linky.

C.
03-29-2007 12:59 PM
ResQguy Just got back from the grocery store. Ok, it doesn't do it as soon as I put it into "D" and take off. It takes a few minutes before the noise begins. Also, it sounds less like marbles in a can and more like a Huey helicopter from a Vietnam movie, haha. Oh, and it's definitely coming from the front somewhere...forward of the dash area and underneath. Any thoughts?
03-29-2007 12:13 PM
ResQguy
Quote:
Originally Posted by erickpl View Post
Catalytic converter on my 97 did the same thing. Made more noise at idle than when moving. When the jeep stopped and turned off, smack the converter with a rubber mallet. If it rattles, there's your problem. You get a different vibration from the engine/tranny when in drive and foot on the brakes than when moving, and that different vibe may be causing the catalytic to rattle funny.

Early TJ's have a known issue with the catalytic.
Nice. I'll give that one a try today. I don't work until 3pm today and I have a few errands to run before I go. Let's see if it gets worse...
03-29-2007 12:12 PM
ResQguy
Quote:
Originally Posted by 1BLKJP View Post
Are you getting any clunking when you shift into drive or reverse? My thinking would be maybe the tranny mount is loose and didn't get tightened down all the way?
Nope, shifts smoothly.
03-29-2007 12:10 PM
Jerry Bransford Vibration in Drive vs. in Neutral is probably just a resonance thing where the culprit will vibrate at the lower Drive RPM but not at the slightly higher Neutral engine RPM.
03-29-2007 12:07 PM
erickpl Catalytic converter on my 97 did the same thing. Made more noise at idle than when moving. When the jeep stopped and turned off, smack the converter with a rubber mallet. If it rattles, there's your problem. You get a different vibration from the engine/tranny when in drive and foot on the brakes than when moving, and that different vibe may be causing the catalytic to rattle funny.

Early TJ's have a known issue with the catalytic.
03-29-2007 12:04 PM
1BLKJP Are you getting any clunking when you shift into drive or reverse? My thinking would be maybe the tranny mount is loose and didn't get tightened down all the way?
03-29-2007 12:00 PM
ResQguy
Quote:
Originally Posted by Jerry Bransford View Post
Maybe it's the catalytic converter heat shield vibrating against the cat or tub? That shield could have been bent a tad during the lift kit installation. Could also be the t-case shifter linkage rattling.
I thought about the cat convertor shield, but wouldn't that vibrate regardless of being in "D" or not? If it's the t-case linkage, is that serious? The lift we installed instructed us how to adjust the linkage in case we weren't able to shift into 4L. The noise is pretty loud. Not hole-in-your-muffler loud, but noticeable. The only reason I haven't been able to tell if it does it when I'm driving is because it's been so freakin' windy here in LA over the last few days and it's just been too loud inside. Like I said, I've only noticed the noise at stop lights and I'm in "D." The noise immediately goes away when I shift to "N" or "R."
03-29-2007 11:55 AM
Jerry Bransford Maybe it's the catalytic converter heat shield vibrating against the cat or tub? That shield could have been bent a tad during the lift kit installation. Could also be the t-case shifter linkage rattling.
03-29-2007 11:31 AM
ResQguy Also, it sounds like it's coming from between the front seats, but that's just a guess.
03-29-2007 11:29 AM
ResQguy Thanks for the responses. I guess I forgot to specifiy that it was an automatic. So, whenever it's in "D" it makes the noise. Honestly, I can't tell if it does it at higher speeds because of the road noise and all. The marbles comment was actually pretty accurate. It sounds exactly like a metal can full of marbles being swirled around whenever it's in "D."
03-29-2007 09:57 AM
mrbigjeep if it doesn't vibrate under acceleration it probably isn't a driveline vibe...may be just part of the "jeep thing"
03-29-2007 04:43 AM
4Jeepn When you say its in Drive, to you mean as in the auto tranny in "d" or the manual in any gear? the manual is known to make a marbles in a can sound until the clutch is pushed in. Thus, where does the sounds/rattle feel like its coming from?
03-29-2007 01:14 AM
ResQguy
Weird vibration

Hey guys...newb here. I just bought my first Jeep a week ago...a '99 TJ. Over the weekend, my buddies and I slapped a Rough Country 4" lift on it with some Mickey Thompson Classic II's (15x8) wrapped in ProComp Mud Terrains (33x12.5). It's going to be a daily driver and rarely offroad, so I wanted to save a little cash. Anyway, here's my problem. Today, I noticed a strange grinding/rattle/vibration coming from underneath. It only happens when it's in drive, and usually only when I'm stopped. The lift was easy to install (we're all helicopter mechanics in the Coast Guard) and it came with a transfer case lowering kit. I don't think the installation was the problem. Since I'm new to Jeeps, is there something I could check out before I break down and take it to a shop? Any input is appreciated.

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