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  #16  
Old October 18th, 2017, 06:33
Green XJ Jeep Green XJ Jeep is offline
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Re: drive train noise.

Are you sure the noise is even coming from the front and not a bad trans mount or something else related to the r&r of the tcase?
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  #17  
Old October 18th, 2017, 06:34
mfascuba mfascuba is offline
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Re: drive train noise.

The carrier will spin, because the axle from the drivers side will turn it. The axles are supported by the carrier (bearings) on the inside, and the hub unit bearings on the outboard sides. The disconnect has a bearing on the inboard side supporting the axle going to the carrier, and a seal on the outboard side that the axle shaft from the wheel hub goes through. When it's disconnected the inner shaft on the disconnect side will be spinning at the same speed as the carrier, with both carrier bearings and the disconnect bearing all moving.
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  #18  
Old October 18th, 2017, 07:15
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90xj06 90xj06 is offline
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Re: drive train noise.

Quote:
Originally Posted by Green XJ Jeep View Post
Are you sure the noise is even coming from the front and not a bad trans mount or something else related to the r&r of the tcase?
the noise sounds like its coming from the front. the trans mount is new. along with engine mounts and upper and lower control arms, shocks, swaybar bushings and links.

i ordered a rebuild kit for the transfer case but i dont want to have to deal with that unless im 100% sure its it that.

Quote:
Originally Posted by mfascuba View Post
The carrier will spin, because the axle from the drivers side will turn it. The axles are supported by the carrier (bearings) on the inside, and the hub unit bearings on the outboard sides. The disconnect has a bearing on the inboard side supporting the axle going to the carrier, and a seal on the outboard side that the axle shaft from the wheel hub goes through. When it's disconnected the inner shaft on the disconnect side will be spinning at the same speed as the carrier, with both carrier bearings and the disconnect bearing all moving.
so even with the drive shaft not spinning the carrier still spins? well at least the bearings do?

i figured the spider gears would just rotate and cause the intermediate shaft to spin in the reverse direction.
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  #19  
Old October 18th, 2017, 07:24
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Anak Anak is offline
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Re: drive train noise.

I do not think the spider gears would be happy if they had to spin at a rate to keep up with tire rotation.
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  #20  
Old October 18th, 2017, 07:57
mfascuba mfascuba is offline
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Re: drive train noise.

Let me think this through - Driver side axle shaft is going wheel speed, passenger is disconnected. Carrier has spider gears, so yes, the spider gears will move and the carrier should be more or less stationary if the driveshaft is stationary and the vehicle is moving. Have you pulled the front driveshaft & seen if the noise is still there? I had a wobbly driveshaft once, pulled it and everything smoothed out nicely. You may have a bad U-joint in the front shaft. There are three of them, cheap fix. Free for the time being if you just pull the shaft out and the noise stops.
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  #21  
Old October 18th, 2017, 08:03
md21722 md21722 is offline
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Re: drive train noise.

The carrier bearings always spin as long as the driveshaft or wheels are turning. Carrier bearings typically make noise under all road conditions as low as 10-20 MPH. To isolate the noise you can run the car on a lift or jack stands. Put your ear to it. Doing carrier bearings properly is not for the unmotivated. For D30/D35, if you are lucky you can take the old bearings off and press new ones on. However, variances in bearing thickness, etc. still may require measuring shims and reshimming. 8.25 requires tools for the side adjusters, setting backlash, etc. By the time you have to deal with all of this, it can be easier to get another good axle from the junk yard.
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  #22  
Old October 18th, 2017, 08:06
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90xj06 90xj06 is offline
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Re: drive train noise.

i did pull the shaft and there was noise. not sure if it was the same noise. however the shift fork was locked at that time the drive shaft was removed. i will remove it when i get home today.

i wonder if the shaft is spinning slowly while the fork is unlocked.

im wondering if there are 2 noises now also. originally i was looking for a faint noise. then this came up. and i assume it was the same noise.
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  #23  
Old October 18th, 2017, 08:09
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90xj06 90xj06 is offline
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Re: drive train noise.

Quote:
Originally Posted by md21722 View Post
The carrier bearings always spin as long as the driveshaft or wheels are turning. Carrier bearings typically make noise under all road conditions as low as 10-20 MPH. To isolate the noise you can run the car on a lift or jack stands. Put your ear to it. Doing carrier bearings properly is not for the unmotivated. For D30/D35, if you are lucky you can take the old bearings off and press new ones on. However, variances in bearing thickness, etc. still may require measuring shims and reshimming. 8.25 requires tools for the side adjusters, setting backlash, etc. By the time you have to deal with all of this, it can be easier to get another good axle from the junk yard.
i have a spare front axle. but the spring seats are all rotted. i was thinking of grabbing one at the junkyard but i would have liked to keep the center disconnect. and put a posi lock in it. but u suppose i don't need to have that.
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  #24  
Old October 18th, 2017, 12:42
Green XJ Jeep Green XJ Jeep is offline
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Re: drive train noise.

Quote:
Originally Posted by mfascuba View Post
Let me think this through - Driver side axle shaft is going wheel speed, passenger is disconnected. Carrier has spider gears, so yes, the spider gears will move and the carrier should be more or less stationary if the driveshaft is stationary and the vehicle is moving. Have you pulled the front driveshaft & seen if the noise is still there? I had a wobbly driveshaft once, pulled it and everything smoothed out nicely. You may have a bad U-joint in the front shaft. There are three of them, cheap fix. Free for the time being if you just pull the shaft out and the noise stops.
Correct which is why driveshafts on disconnect front ends were horribly balanced from the factory. They dont spin all the time so need need for spot on balancing.
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  #25  
Old October 18th, 2017, 12:49
Green XJ Jeep Green XJ Jeep is offline
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Re: drive train noise.

Quote:
Originally Posted by 90xj06 View Post
i have a spare front axle. but the spring seats are all rotted. i was thinking of grabbing one at the junkyard but i would have liked to keep the center disconnect. and put a posi lock in it. but u suppose i don't need to have that.
This isnt as finnicky as a posi lock
http://www.wranglerforum.com/f290/4w...s/76453?page=1
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  #26  
Old October 19th, 2017, 08:13
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90xj06 90xj06 is offline
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Re: drive train noise.

i pulled the driveshaft and the noise is still there. and the vacuum actuator was bad. i ordered a posi lock but i must have ordered the one for a 3-6in lift.

the noise seems to stay a constant speed but sounds like it goes away if bumps are hit and the jeep is bouncing up. it sounds slightly jingly sounding like a bell sometimes.
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  #27  
Old October 19th, 2017, 15:06
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90xj06 90xj06 is offline
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Re: drive train noise.

i had time to get the rear end up on jackstands today. rear end seemed to make no noise but the passengers side rear brake was dragging a bit. even with the tcase in 4wd part with no front shaft i could not hear any noise.

so im hoping its just that bearing on the intermediate shaft as it should not be that bad to fix. i could slightly feel a vibration equal to the noise in the steering wheel also which is why i really think its from the front end.

it also does not help that one of my tires is out of balanced and cupped along with a mild toe out. im wondering if i shook the bearing to bits lol.
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  #28  
Old October 19th, 2017, 18:39
lawsoncl lawsoncl is online now
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Re: drive train noise.

Quote:
Originally Posted by 90xj06 View Post
i had time to get the rear end up on jackstands today. rear end seemed to make no noise but the passengers side rear brake was dragging a bit. even with the tcase in 4wd part with no front shaft i could not hear any noise.

so im hoping its just that bearing on the intermediate shaft as it should not be that bad to fix. i could slightly feel a vibration equal to the noise in the steering wheel also which is why i really think its from the front end.

it also does not help that one of my tires is out of balanced and cupped along with a mild toe out. im wondering if i shook the bearing to bits lol.
Or the cupping is due to a bad bearing? No noise in the air would tend to point to a bad wheel bearing.
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  #29  
Old October 20th, 2017, 06:28
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90xj06 90xj06 is offline
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Re: drive train noise.

i checked the bearings. seem tight and smooth. i will replace them anyhow. also im not 100% sure that the cupping is from this jeep. the tires are from my other jeep.

im going to attempt to remove the rear driveshaft and run it with the front axle up in the air. and hopefully find the noise.
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  #30  
Old Today, 15:58
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90xj06 90xj06 is offline
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Re: drive train noise.

so... it may have been wheel bearings. noise seems to have gone away.

i still have my transfercase noise but that can wait until the spring.
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