Thumping Noise: UPDATE on orignal post

Fulltimer · **Posted:** Fri Jan 08, 2010 7:48 am

I just had the front drive shaft replaced and now I have a deep sounding thumping noise that wasn't there before. I put it in 4WD and there isn't any change from 2WD. It starts at about 40mph and doesn't seem to increase with speed. As I said it is a deep sounding noise, like a base note.

I'll be gone until Monday, celebrating our 16th. anniversary, so I won't be able to take it back right away. Any ideas anyone?

Terry

UPDATE: I took the KJ to a garage to have Al's A-Arms put on & new brakes. The drivers side arm hits the spring. It's on a lift when it hit & no tire on it. If you rotate the axle while it was up in the air it's very hard to turn and there is that thumping noise.

BTW: they measure both of the Al's arms and they are NOT the same. I emailed him about it. Right now the shop is going to put my old arms back on. Then I can check out the problem with the arms. Also I will be able to have that axle checked out.

What is going on with these 2 problems?

JeepinJarhead03 · **Posted:** Fri Jan 08, 2010 8:42 am

there a vibration with it? or just the noise, floorboard etc?

on a joke note, perhaps you should remove the dead cat that crawled up in there

Fulltimer · **Posted:** Fri Jan 08, 2010 9:20 am

Hmmm, a dead cat, maybe! There isn't any vibration. The thumping isn't loud at all and I can't feel it either.

Terry

FreedomKJ · **Posted:** Sat Jan 09, 2010 1:10 am

It's the tell-tale heart.

JeepinJarhead03 · **Posted:** Sat Jan 09, 2010 1:21 am

well they don't just thump for no reason

doesn't increase with speed, deep...

like how fast is this bumping ? like a double time maybe a little faster?

i had a crew cab chevy truck that would put itself almost into 4wd that would do that when the speed/vibration/etc of the driveline components got fast enough, something or other would sit there and shake back and forth making a bumping noise, passenger could feel it in the floorboard, i couldn't

try engaging the 4wd and then disengaging it again, wrangler reverse roll back style ya know

maybe they bumped some linkage or something

Diggerfreek · **Posted:** Sat Jan 09, 2010 1:35 am

Seems like quite a few intermediate shaft have been dieing recently.... I don't know what the symptoms are when they go out/start to go out

tommudd · **Posted:** Sat Jan 09, 2010 2:59 am

If the CV/intermediate shaft get real bad there will be a thumping sound, at least Chris' was by the time we changed it out. :wink:

meh_kick · **Posted:** Sat Jan 09, 2010 3:02 am

tommudd wrote:

If the CV/intermediate shaft get real bad there will be a thumping sound, at least Chris' was by the time we changed it out. :wink:

Mine only had three or four splines worn and it made the same thumping Terry's talking about.

JeepinJarhead03 · **Posted:** Sat Jan 09, 2010 3:13 am

this is awkward to say

did ya see rob's shaft? thing was progressing into a 30 lb toothpick

Fulltimer · **Posted:** Sat Jan 09, 2010 11:25 am

I'll have it checked out on Monday. Kind of strange situation.

Terry

Fulltimer · **Posted:** Sat Jan 09, 2010 1:54 pm

yellocoyote wrote:

JeepinJarhead03 wrote:

this is awkward to say

did ya see rob's shaft? thing was progressing into a 30 lb toothpick

It is kind of funny! :SOMBRERO:

Terry

Fulltimer · **Posted:** Sat Jan 16, 2010 5:10 pm

Please read the 1st. post for additional information.

Terry

offroadohio · **Posted:** Sat Jan 16, 2010 7:11 pm

BOTH of my Al's arms hit the spring when on a lift. I also hear them touch the spring on hard bumps from time to time, its something I didnt have an issue with until I put the al's arms on.

As for the thumping, I have that too, I thought it was a wheel bearing at first, and replaced one, it seemed to go away but came back again. Ive been trying to track it down, with no luck. I havent pulled the front driveshaft yet but its next on the list.

ShafferNY · **Joined:** Wed Dec 26, 2007 3:51 pm **Posts:** 88

I'm curious about this thread. I've developed a very faint rattle sound over the last month. It's barely noticable, but I've heard it a few times. I'm thinking it's drivetrain related because I couldn't hear it with it in park, even while revving the engine. This may give me something to look at.

stumpjumper_09 · **Posted:** Sat Jan 16, 2010 9:04 pm

Take it out and beat on it for a little while. that seems to cure most of my problems. It either loosens up or breaks. I call it STUMPJUMPER Diagnostics

tjkj2002 · **Posted:** Sat Jan 16, 2010 10:25 pm

If you cut the UCA pockets for the UCA's you might want to read the thread in the link below.

http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=41286&hilit=+CV+UCA+pockets

JL Rockies · **Posted:** Sun Jan 17, 2010 12:12 am

Dude...... the arms are not supposed to be the same length? That's jacked-up.

JeepinJarhead03 · **Posted:** Sun Jan 17, 2010 1:31 am

i'm not following, what was the length error?

Fulltimer · **Posted:** Sun Jan 17, 2010 4:58 am

All I know is that they measured the 2 arms and said that they were not the same. I'll pick up the KJ Sunday and measure them myself.

Terry

501 · **Posted:** Sun Jan 17, 2010 12:40 pm

Fulltimer wrote:

UPDATE: I took the KJ to a garage to have Al's A-Arms put on & new brakes. The drivers side arm hits the spring. It's on a lift when it hit & no tire on it. If you rotate the axle while it was up in the air it's very hard to turn and there is that thumping noise.

BTW: they measure both of the Al's arms and they are NOT the same. I emailed him about it. Right now the shop is going to put my old arms back on. Then I can check out the problem with the arms. Also I will be able to have that axle checked out.

What is going on with these 2 problems?

What version of Arms do you have? I have the 3.5's and I notice that my driverside arm also hits my coils.

Thumping Noise: UPDATE on orignal post

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