Rattle Question @ 1500 RPM - Automatic Transmission? - JeepForum.com

 
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post #1 of 9 Old 09-03-2008, 08:40 AM Thread Starter
paulilhama
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Rattle Question @ 1500 RPM - Automatic Transmission?

Hey, everyone. I'm trying to diagnose a rattle I've been hearing.

I've got a mostly stock '06 TJ Unlimited with Automatic Transmission.

With the windows open or the top off, I've been hearing a rattle in the front end. I have been under there, but everything seems as tight as it should be (but I'm not too experienced on suspensions and drivelines.

I thinked I've finally nailed down the conditions to make it repeatably happen.

When I'm driving around 45-50 mph and the engine is running at 1500 RPMs, i can hear a slight rattle from under. I finally realized this because if I eased off the gas, then pushed the accelerator again, the transmission would shift gears, go up to ~2000 RPM, and the sound would go away. Then as the engine came back down to around 1500 while I maintained 45-50, the sound would come back. If I turn the O/D Off and am running around 2000 RPM at that speed, i don't hear the sound.

Further, (and this may be an incorrect observation), it only seems to happen when I am mostly flat or climbing a grade. If I'm going down a slightly incline and need to give it gas to maintain speed, I don't think I hear it. But that could just be me.

Any ideas?

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post #2 of 9 Old 09-03-2008, 09:15 AM
M2LJ
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Does it almost sound like a diesel rattle or a bunch of crickets? I've got the same thing...and I am running a nearly identical rig (05 LJ w/auto; but mine has 31" MTs on it). I'd also be interested in knowing what this could be!

Cheers! M2
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post #3 of 9 Old 09-03-2008, 10:06 AM
IslandTJ
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When I had a similar rattle - it was due to the heat shield rattling against the exhaust manifold pipe in the engine bay. I just bent the shield further away from the pipe and the rattle was gone. Oh and the rattle was intermittent.

1998 Sahara TJ

Now Jeeping in Oregon
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post #4 of 9 Old 09-03-2008, 10:52 AM
M2LJ
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The only reason I am not sure that is the source of the noise for us is that it doesn't always occur at 1500 rpms; only when the transmission is in OD. But, I am willing to give anything a try...

Cheers! M2
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post #5 of 9 Old 09-04-2008, 07:04 PM
M2LJ
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I'm in Tampa for a few days, sans Jeep...paulihana, did you try this on your LJ?

Cheers! M2
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post #6 of 9 Old 03-23-2010, 11:16 AM
alphajeep
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My '06 Unlimited has been having the same issue for years...noticed it early on...and it is exactly as you described. It starts rattling at around 43 MPH. Brought it in numerous times. Dealer said they could never hear it and then they went out of business. I know this is an old thread, but did you ever find out what causes it???
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post #7 of 9 Old 03-23-2010, 03:29 PM
ChicagoRod
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I haven't had the rattle described but I haven't had my hard top off yet but I will soon. I did have another rattle for a few days after I installed my Gale Banks exhuast but I fixed that by removing the socket that I left on the top of my skid plate.
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post #8 of 9 Old 03-23-2010, 04:02 PM
LJameson
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Thats your engine knocking because it's lugging.

1990 YJ-The wheeler
2015 JK- The DD
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post #9 of 9 Old 03-23-2010, 04:11 PM
Unlimited04
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Quote:
Originally Posted by alphajeep View Post
My '06 Unlimited has been having the same issue for years...noticed it early on...and it is exactly as you described. It starts rattling at around 43 MPH. Brought it in numerous times. Dealer said they could never hear it and then they went out of business. I know this is an old thread, but did you ever find out what causes it???
yea, its because the transmission is a piece of crap and should never have been put in a Wrangler.

Same question was already asked today: http://www.jeepforum.com/forum/f9/20...roblem-350953/

Read these:
http://www.jeepforum.com/forum/f9/al...s-here-990762/
http://www.jeepforum.com/forum/f9/42...rdrive-488510/

Quote:
Originally Posted by jeepfreak4life7 View Post
Thats your engine knocking because it's lugging.
yup. Jeep claims its supposed to do that.
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