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 Post subject: Front diff humming?
PostPosted: Sun Jan 13, 2013 8:36 pm 
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I am buying a 96 grand cherokee with the 4.0l v6 the front diff hums but only after you have been using the 4x4
does not hum before 4 wheel drive is used only after for maybe a mile or 2 or driving an then stops any ideas?


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 Post subject: Re: Front diff humming?
PostPosted: Mon Jan 14, 2013 12:58 pm 
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Pinion bearings. It's a low pinion Dana 30, and being a '96 most likely has the cv drive shaft. If it does, get rid of it. Go to the junk yard, pull the yokes off a Cherokee, or some grands with a normal u joint style shafts. There all the same for the axle, but not t-cases. The 249, 242, etc. has a bigger front out put then the 231. A 231 might be a good option to, if you have "all time 4x4" the swap will give you a 2 wheel drive option.

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 Post subject: Re: Front diff humming?
PostPosted: Mon Jan 14, 2013 2:53 pm 
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I dont have all time 4x4 i have 2wd option.
I am new to the jeep world what is the difference between the u joints I have and the "normal" ones?


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 Post subject: Re: Front diff humming?
PostPosted: Mon Jan 14, 2013 3:35 pm 
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The u joint looks like a cross, the cv will be round and have a rubber boot on it. U joints are stronger then the cv, and are serviceable. The cv is basically worthless, and brakes easily with bigger tires, lift, etc. I would suggest taking it to a diff shop, setting gears up properly isn't easy, and requires lots of very expensive tools.

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 Post subject: Re: Front diff humming?
PostPosted: Tue Jan 15, 2013 8:56 pm 
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ROCK! wrote:
The u joint looks like a cross, the cv will be round and have a rubber boot on it. U joints are stronger then the cv, and are serviceable. The cv is basically worthless, and brakes easily with bigger tires, lift, etc. I would suggest taking it to a diff shop, setting gears up properly isn't easy, and requires lots of very expensive tools.

ok thanks alot i appreciate it


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