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  #16  
Old November 10th, 2019, 19:22
RCP Phx RCP Phx is offline
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Re: going crazy... rattle noise

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Originally Posted by lazyxj View Post
Try setting the rear axle on jack stands, remove the wheels and rear driveshaft and then spin the pinion shaft with your hand, feeling for roughness or a loose yoke.
A shop is going to charge you $100+ an hour to search for this noise, searching more deeply yourself could save you a bundle and it's a lot more satisfying finding the problem yourself.
Wise words spoken there!
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  #17  
Old November 11th, 2019, 21:28
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Re: going crazy... rattle noise

Took it to a diff shop today-
They agree its the pinion bearing and for $550 including parts and labor to redo all the inner bearings its not a ripoff.
just gonna pay them and check this off the list.
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  #18  
Old November 11th, 2019, 21:34
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Re: going crazy... rattle noise

Quote:
Originally Posted by lazyxj View Post
Try setting the rear axle on jack stands, remove the wheels and rear driveshaft and then spin the pinion shaft with your hand, feeling for roughness or a loose yoke.
A shop is going to charge you $100+ an hour to search for this noise, searching more deeply yourself could save you a bundle and it's a lot more satisfying finding the problem yourself.

Done that about 5 weeks ago. and again last weekend.
Nothing is loose.
Nothing makes noise.
Noise only happens at 5-10 mph on ground. nothing more nothing less.
I am not gonna spin the driveshaft quick enough to cause it sadly.
I am almost 100% sure its a stuck/frozen roller in the top of the yoke. due to worn down bearings the pressure is not on it until driving force is applied.
or at least that's what it sounds like.
gonna throw the $550 at the shop and hope to science it fixes this 3 month nightmare of finding this..
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  #19  
Old November 12th, 2019, 10:25
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: going crazy... rattle noise

i have a click type sound that threw me for a loop this summer. turns out it was the spider gears ( but this was my front diff). this was audible by pulling the diff cover and spinning the axle shaft. i only heard it when slowing down, usually a short ways before stops.


any chance you can wire your phone up near the axle ?
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  #20  
Old November 12th, 2019, 11:55
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Re: going crazy... rattle noise

Diff shop just called.
Pinion bearing is shot. Gears are not terrible but have some sharp edges on teeth. Replacing gear and pinion while in there.
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  #21  
Old November 12th, 2019, 13:36
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lazyxj lazyxj is offline
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Re: going crazy... rattle noise

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Originally Posted by blu3fan View Post
Diff shop just called.
Pinion bearing is shot. Gears are not terrible but have some sharp edges on teeth. Replacing gear and pinion while in there.
This would be the time to drop in a locker or, my preference, a Truetrac.
I have used Truetracs for a couple decades and love how they are invisible and work all the time. My 2001 XJ's Truetrac has about 150,000 miles on it and still works like new.
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  #22  
Old November 12th, 2019, 17:52
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Re: going crazy... rattle noise

Quote:
Originally Posted by lazyxj View Post
This would be the time to drop in a locker or, my preference, a Truetrac.
I have used Truetracs for a couple decades and love how they are invisible and work all the time. My 2001 XJ's Truetrac has about 150,000 miles on it and still works like new.
If I had the money id totally do it.
The shop let me know my driveshaft is binding a little bit due to the lift and I suspect that is why the pinion bearing failed.

They said they do a custom driveshaft and slip yoke eliminator for 900 out the door. I dont know if they know I have a 242.. im going to inquire more about that around tax time.
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  #23  
Old November 12th, 2019, 17:59
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Re: going crazy... rattle noise

but honestly probly do a hack and tap and have them make me a driveshaft.
This shop actually seems reliable not not ripoff prices.
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  #24  
Old November 13th, 2019, 17:32
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Re: going crazy... rattle noise

so.
Just picked her up from the shop.
about half of the noise is gone.
so I think I have had two issues.
The bad noise appears gone- and now I just have something residual to figure out. still a rattle. but nowhere near as bad.
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  #25  
Old November 13th, 2019, 21:06
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: going crazy... rattle noise

is it the same sound?

im glad you figured out your pinion issue. do you have a slip yoke that could be rattling around on the tc ouput? those can make weird noises
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  #26  
Old November 13th, 2019, 21:10
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Re: going crazy... rattle noise

if any of your remaining sounds are in the fashion of your described first post, I still would pull driveshafts as Anak suggested. It will narrow down a lot of options quickly if something changes.
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  #27  
Old November 16th, 2019, 07:29
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Re: going crazy... rattle noise

so the remaining noise- I have narrowed down to something in the xfer case or transmission.
Im over trying to diagnose it- just gonna drive til it breaks or gets worse to the point that I can figure it out.
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