Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > 98 tj knocking on takeoff

Join Wrangler Forum Today

Thread: 98 tj knocking on takeoff Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-17-2013 07:36 PM
timboburks Mine is a 2000 auto. Just had it lifted a few weeks ago, and had something similar. Turned out to be the transmission mounts were rotten. Don't really know anything about it, but the guy I took it to said he crawled under it, grabbed the driveshaft and shook on it, and could see the transmission moving.
05-17-2013 06:33 PM
UFOtestpilot I would have done the Novak cable now, but I couldn't spare the funds at the moment and I couldn't stand the knocking any longer. I will get the cable in the long run though.
05-17-2013 04:18 PM
s14sh3r Yes, wd-40 makes a spray lithium grease. I don't have a picture to show you where the knocking is coming from and it's kind of hard to see because of the skid plate. There is a rod that runs side to side. It fits into a bushing and bracket next to the body. I can grab that rod and move it up and down and it makes the same noise it does when I take off. I'll replace the bushing one of these days and fix it for good.
05-17-2013 03:58 PM
lgoss5127 ill have to re-check my control arms. if thats not it ill the white lithium lol wd-40 has white lithium dont they?
05-17-2013 03:55 PM
s14sh3r Mine does it and it's the transfer case linkage. I sprayed the hell out of the bushing it rides in with white lithium grease and it's stopped it for now.
05-17-2013 03:38 PM
SuicideSaints I had a similar sound, 3-4 knocks when first taking off. If I went real slow it didn't do it. It ended up being loose control arms. The first time I tried to find it the control arms seemed fine then I put my jeep on level ground with no e brake and tried again. I found two loose control arms. Make sure you check both sides of each arm.
05-17-2013 03:10 PM
GoldenSahara00 I do, and it is. Because it lets you use your 4wd reliably. lol. And I can adjust it with any changes I make in the future.
05-17-2013 02:53 PM
lgoss5127 well its not the exhaust, i shook everything down there and everything seems to be on there pretty tight. i'm starting to think it might be a the transfer case linkage and im kinda leaning toward the novak cable. does anyone have that installed on theirs? is it worth the money?
05-17-2013 01:59 PM
lgoss5127 Thanks guys. I'm gonna do a very thorough inspection of it today when I get off work. Ill let you know what I find!
05-17-2013 09:40 AM
GoldenSahara00 I had a knock from the old linkage before I replaced mine as well, just throwing out some more. I currently have 1 broken hanger and 1 loose hanger on my exhaust, and the tip just contacts the hitch and makes a noise like described on hard throttle.
05-17-2013 09:00 AM
Originally Posted by GoldenSahara00 View Post
Could be the exhaust.
lol, that's definitely a good place to start. Having gone through the laundry list of possibilities for my mystery noise before I found it, I often forget that the cause of mine won't be the cause of everyone's.
05-17-2013 05:02 AM
GoldenSahara00 Could be the exhaust.
05-17-2013 04:32 AM
UFOtestpilot It may be the way your jeep was lifted as well, you may be missing a component for your linkage. If you've got the money and it turns out to be t-case linkage knock, get the Novak cable and call it a day. If you have everything there but the bushing at the torque rid knocks and rattles when you wiggle the heck out if it, then this could very well be your issue.
05-17-2013 04:27 AM
UFOtestpilot Sounds like the transfer case linkage knock.
05-17-2013 04:23 AM
somis There are lots of possibilities. Much to vague. I'm assuming its coming from somewhere in the driveline. (MOTOR, TRANSMISSION, TRANSFERCASE, REAR AXLE)
But I could be wrong. Does it sound like a metal on metal connection?

If its possible, find a shop with an actual lift and let them use a stethoscope to pin-point the issue. From there I am sure they will be able to diagnose your issue.

I'd tell you to put it on jackstands and try this yourself with a buddy but I dont want to be responsible for a death. Be careful if you do try that.
05-17-2013 12:30 AM
98 tj knocking on takeoff

I have a 98 TJ with 109k on it. Lifted 3" with 33's. i noticed when I take off in first it knocks 3 to 4 times. The faster I let out the clutch the louder it is. If I let it out slow it won't do it. Does anyone have any idea of what it could be? I'm new to the jeep scene so I'm not sure of what it could be. It just doesn't sound like it should be there.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 06:26 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC