Weird thunk noise when engaging clutch. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Four Wheeling Forums > Wheelin' Neighborhood > South West USA > Utah Jeep Forum > Weird thunk noise when engaging clutch.

Rampage Bowless Soft Top Oconee offroadAlloy USA Still AvailableAdvance Adapters SYE Kits

Reply
Unread 11-26-2012, 09:30 PM   #1
YJYNOTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2012
Location: Saratoga Springs, Utah
Posts: 193
Tj Weird thunk noise when engaging clutch.

I've got a 03 rubicon I've had for about a month now. Not sure why I didn't notice it before I bought it, but I've got a weird thunk noise when disengage the clutch... mainly between 1-2-3 gears. If I let the pedal out real slow it's not there. Almost reminds me of auto lockers will suddenly engage or disengage.

I can also replicate the noise by letting it coast a little and then hitting the gas hard. So seems to be related to when torque is applied.

Shifts, really smooth other than that. Way better than my YJ did. Searching the interwebs seems like it could be a couple of things:

1. U joints going out.
2. Transmission, transfercase or motor mounts are lose or bad.
3. A bent fly wheel.

U joints look ok, there no slop or noise when I'm under it and try turning the rear driveshaft. When it's in gear I can turn it at all.

I know that the motor mounts are fairly new... look good from what I can see.

I can't see and obvious place underneath that it's hitting if something is loose under there.

Anyway, anybody experience something similar?

__________________
2003 TJ Rubicon
93 Wrangler YJ (Sold)
08 Liberty KK 245/75R16 | 3.5 front 2.5 rear RockKrawler Lift
YJYNOTJ is offline   Reply With Quote Quick reply to this message
Unread 11-26-2012, 10:00 PM   #2
Mickey_D
Registered User
1997 ZJ 
 
Join Date: Aug 2008
Location: 40 3'42.36"N 112 2'16.73"W, Utah
Posts: 6,793
Believe it or not, check your control arms. Specifically the end links. My first thought is that the axle is trying to rotate around the shafts (if that makes sense). On a leaf sprung vehicle what I'm talking about would be called axle wrap.

A bent flywheel wouldn't be noticeable with the clutch fully engaged. It would only act up when there was slippage on the clutch with power applied. It would also be worse the more power was applied. And it wouldn't be a single clunk, it would be a repetitive chatter (been there, done that).

What you're describing sounds more like a mount. Specifically engine, trans or xfer case.
__________________
1997 ZJ 5.2 Orvis, Baby!
1953 Willys M100 trailer Tagalong
________________
[_][][][][][][][][_]


Mickey_D is offline   Reply With Quote Quick reply to this message
Unread 11-26-2012, 10:26 PM   #3
YJYNOTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2012
Location: Saratoga Springs, Utah
Posts: 193
Interesting, I just crawled under it and rear driver control arm I could shake it enough to have it make "clunk" noise. Not nearly as loud but I can't torque it like the rear axel can. I couldn't get any of the other arms to make any movement.
So I guess the fix is new bushings? Thanks for the info
__________________
2003 TJ Rubicon
93 Wrangler YJ (Sold)
08 Liberty KK 245/75R16 | 3.5 front 2.5 rear RockKrawler Lift
YJYNOTJ is offline   Reply With Quote Quick reply to this message
Unread 11-26-2012, 10:47 PM   #4
Godholio
Registered User
2012 JK Wrangler 
 
Join Date: Jan 2007
Location: West Haven, UT
Posts: 1,903
Check your fluid levels too. I was pulling my hair out trying to figure out a transmission noise in my other car before I decided to check the fluid...which was down to 1/3 the proper amount.
__________________
Utah Jeep Crew #148
No powerball here? How am I supposed to finance the mods?!?
'12 Sport...miss my YJ for all the wrong reasons though
Godholio is offline   Reply With Quote Quick reply to this message
Unread 11-27-2012, 05:44 PM   #5
Mickey_D
Registered User
1997 ZJ 
 
Join Date: Aug 2008
Location: 40 3'42.36"N 112 2'16.73"W, Utah
Posts: 6,793
Quote:
Originally Posted by YJYNOTJ View Post
So I guess the fix is new bushings? Thanks for the info
Perfect time to swap out for adjustables for a lift!!
__________________
1997 ZJ 5.2 Orvis, Baby!
1953 Willys M100 trailer Tagalong
________________
[_][][][][][][][][_]


Mickey_D is offline   Reply With Quote Quick reply to this message
Unread 11-27-2012, 06:12 PM   #6
YJYNOTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2012
Location: Saratoga Springs, Utah
Posts: 193
Quote:
Originally Posted by Mickey_D View Post
Perfect time to swap out for adjustables for a lift!!
Yeah just need to find $1500 in my couch cushions.
__________________
2003 TJ Rubicon
93 Wrangler YJ (Sold)
08 Liberty KK 245/75R16 | 3.5 front 2.5 rear RockKrawler Lift
YJYNOTJ is offline   Reply With Quote Quick reply to this message
Unread 11-27-2012, 08:29 PM   #7
Mickey_D
Registered User
1997 ZJ 
 
Join Date: Aug 2008
Location: 40 3'42.36"N 112 2'16.73"W, Utah
Posts: 6,793
I hear ya. Believe me I do.
__________________
1997 ZJ 5.2 Orvis, Baby!
1953 Willys M100 trailer Tagalong
________________
[_][][][][][][][][_]


Mickey_D is offline   Reply With Quote Quick reply to this message
Unread 11-28-2012, 03:51 PM   #8
cbandit
Member
1997 TJ Wrangler 
 
Join Date: Jul 2009
Location: utah
Posts: 327
Talk to aj at Teraflex. Tell him you're a member of the ujc and he will prob give you a discount. Do just the arm and its counterpart for now to save some cash
cbandit is offline   Reply With Quote Quick reply to this message
Unread 11-28-2012, 04:09 PM   #9
YJYNOTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2012
Location: Saratoga Springs, Utah
Posts: 193
Quote:
Originally Posted by cbandit View Post
Talk to aj at Teraflex. Tell him you're a member of the ujc and he will prob give you a discount. Do just the arm and its counterpart for now to save some cash
Having only had it a month, not sure but I think they are Rubicon Express Short Arms that came with the 4inch lift, defiantly not adjustable. The one I think that is the problem has quite a bit of rust around the lower bushing.

Yeah I've thought about just replacing them all with a cheaper short arm kit, at least the rear ones for now.

Teraflex is and option, I've thought about the Jonny Joint kits, any thoughts from anyone best flexing short arm kits?
__________________
2003 TJ Rubicon
93 Wrangler YJ (Sold)
08 Liberty KK 245/75R16 | 3.5 front 2.5 rear RockKrawler Lift
YJYNOTJ is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.