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Old October 15th, 2012, 05:32 PM   #1
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weird driveline noise

its from 25 to 50 mph and its when im in the gas its like a woooo noise let off the gas and it goes away so it is when it has a load on it is this pinion bearing noise? its a 2000 jeep cherokee 8.25 rear axle to it sounds like its is coming from the rear end checked drive shaft that seems to be fine its has a sye with a tom woods driveshaft fairly new so dont think it could be the u joints any help would be great ty
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Old October 16th, 2012, 01:24 PM   #2
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anyone?
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Old October 16th, 2012, 01:52 PM   #3
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Wooo could be any number of things. Rear end to vacume leak. Wheel bearings dont change from rpm. What happens when you slalomn down the road under power.
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Old October 16th, 2012, 06:47 PM   #4
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nothing its just when u apply the gas and def not a vacume leak def in the driveline it sounds like it is comeing from the rear end
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Old October 16th, 2012, 10:32 PM   #5
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Sounds like pinion noise to me.Grab the rear yoke and see if it has any play up n down.Is the pinion seal leaking? That could be a sign of bad pinion bearings,unless you are in the mud a lot. You can try to snug the pinion nut up just a little and see if the noise changes,be carefull dont over torque your crush sleeve.
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Old October 16th, 2012, 10:38 PM   #6
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Pinion bearings. The pinion nut probably isn't torqued to the right spec. Their tricky if you don't do them right. I didn't do one right and had the same noise. Few weeks after I started hearing the howl/ whine, I let off the gas and BOOM blew the bearings and ate the teeth on the pinion right up.
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Old October 16th, 2012, 10:42 PM   #7
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Sounds like pinion bearings. One of my trucks did that last week. Pinion bearing was going out.
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Old October 16th, 2012, 11:39 PM   #8
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ya it started after the i put the lift on it and it didnt have the sye yet theres no play in it but i did have to change the yoke and when i did that it went away for like a week now im useing it as a dd and the noise is really annoying im thinking of just getting another axle and just swap it out cause everyone wants alot to change the bearing
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Old October 16th, 2012, 11:40 PM   #9
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anyone know what the right torque is?
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Old November 28th, 2012, 11:03 PM   #10
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tighten the pinion nut 1 flat and see if it gets better.
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Old December 1st, 2012, 09:10 AM   #11
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Proper pinion angle? Did you adjust it after the lift? After you put the cv shaft in? (I assume its a cv style shaft)

Cv style need a diffrent working angle than your reg. driveshaft.
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