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  #1  
Old August 22nd, 2008, 13:30
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dan302492 dan302492 is offline
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odd noise when letting off gas

been trying to figure out what this was for a while. while driving usually a bit over 30 and higher it makes an odd noise coming from what sounds to be my transfercase and then when i get back on the throttle it makes a small clunk noise then its gone. sorry for the ill discription. could this be a overly stretched drive chain making that noise after it picks up the slack or the output shaft bearing(does not leak though)??? I know its not the driveline u-joints because i have checked them multiple times.
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Old August 22nd, 2008, 13:32
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WaXJ_Skier WaXJ_Skier is offline
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Re: odd noise when letting off gas

Quote:
Originally Posted by dan302492
been trying to figure out what this was for a while. while driving usually a bit over 30 and higher it makes an odd noise coming from what sounds to be my transfercase and then when i get back on the throttle it makes a small clunk noise then its gone. sorry for the ill discription. could this be a overly stretched drive chain making that noise after it picks up the slack or the output shaft bearing(does not leak though)??? I know its not the driveline u-joints because i have checked them multiple times.
I would still lean towards driveshaft ujoints.
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  #3  
Old August 22nd, 2008, 13:49
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dan302492 dan302492 is offline
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Re: odd noise when letting off gas

they would have to be very well worn though to make the clunk noise when i get back on the gas though
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Old August 22nd, 2008, 15:47
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Re: odd noise when letting off gas

Tranny mount on the crossmember.....
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  #5  
Old August 22nd, 2008, 15:48
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housemaster0630 housemaster0630 is offline
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Re: odd noise when letting off gas

the same thing happens to mine

it does sound like it is comming from the transfer case
but mine happens when i come to a complete stop and start up again

its like the rear of the jeep is kept up in the air a bit and then suddenly dropped

like the slip yolk isnt doing its job correctly
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Old August 22nd, 2008, 15:58
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UNCC_99XJ UNCC_99XJ is offline
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Re: odd noise when letting off gas

Quote:
Originally Posted by housemaster0630
the same thing happens to mine

it does sound like it is comming from the transfer case
but mine happens when i come to a complete stop and start up again

its like the rear of the jeep is kept up in the air a bit and then suddenly dropped

like the slip yolk isnt doing its job correctly
In your case, all you need to do it take the driveshaft off and grease the slip yoke....it's a fairly common issue....drove mine for a couple years doing that....always thought it was the brakes maybe sticking a little bit. I read about it on here and had the DS off changing a ujoint, slapped some grease on the output shaft and put the DS back on and the "thump" went away.
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  #7  
Old August 22nd, 2008, 16:40
Deadman 94 xj Deadman 94 xj is offline
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Re: odd noise when letting off gas

if you're talking about what I think you're talking about, it seems like some sort of gear backlash in the transmission.
When I'm on the throttle and let off, it kind of clunks back in when I get back on the throttle. I can hear the down shift through the exhaust when it does this.

Mine has done this since it was stock. If it's the same thing, it's not the transfer case because I'm running a different case and it still does it.

All in all I think it's prety cool lol.

Mines a 96 with 110 on the clock and shifts perfectly FWIW, my old 94 didn't do this.
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Old August 22nd, 2008, 16:41
Deadman 94 xj Deadman 94 xj is offline
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Re: odd noise when letting off gas

Quote:
Originally Posted by UNCC_99XJ
In your case, all you need to do it take the driveshaft off and grease the slip yoke....it's a fairly common issue....drove mine for a couple years doing that....always thought it was the brakes maybe sticking a little bit. I read about it on here and had the DS off changing a ujoint, slapped some grease on the output shaft and put the DS back on and the "thump" went away.
X2 on the slip yoke.
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Old August 22nd, 2008, 16:44
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Re: odd noise when letting off gas

i guess ill give that a try and see if the sound dissapears
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  #10  
Old August 22nd, 2008, 16:47
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Re: odd noise when letting off gas

if U have already checked driveshaft & u-joint check your rear diff, I'd similar problem on the diesel one, the pinion nut was a bit loose so no preload and some play on the pinion, I was luky to discover it before destroy my 4.11.....
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  #11  
Old August 22nd, 2008, 17:13
cherokee chuck cherokee chuck is offline
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Re: odd noise when letting off gas

Unexpectedly, my mystery clunk I've since I dropped my t/c might be solved. Gracias people. I guess it's time for an sye. Dropping the case cured the vibes but I've had clunk with the drop feeling ever since. I changed the mounts, retorqued u-bolts, shackles, etc. It only happens when taking off in a straight line at brisk acceleration & only occasionally so I've living with it. I'm replacing my springs in the near future & figured that would cure it but I'm going to try grease on the yoke tonight!
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