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Unread 12-30-2010, 02:27 PM   #1
91wranglerwilly
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1991 YJ Wrangler 
 
Join Date: Oct 2010
Location: greenwood lake
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grinding sound

so me and my dad took my jeep over are moutain to the train station.he was driving. we werent driving hard or anything and we had noticed a sort of grinding sound so we looked to see if anything looked like it was grinding so we kept going. i had got in it this morning and its still makeing the sound. i had got an oil change yesterday if that makes a difference. do the diffs take fluid? could it be the tranny not be adjusted to him driving i need help

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Unread 12-30-2010, 03:50 PM   #2
MJMPC
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Where did it sound like the grinding was coming from? Yes the diffs take rearend oil.
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Unread 12-30-2010, 03:56 PM   #3
91wranglerwilly
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it sounds like its coming the transfer case to the front differential
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Unread 12-30-2010, 03:58 PM   #4
91wranglerwilly
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it was in 2wd when i noticed . so i put it in 4wd and it was louder
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Unread 12-30-2010, 05:41 PM   #5
91wranglerwilly
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could it be i just have to get undernath and grease everything really good?
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Unread 12-30-2010, 07:23 PM   #6
Mark05059
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might be a good idea to drain and refill both the transfer and transmission fluids.
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Unread 12-30-2010, 07:45 PM   #7
91wranglerwilly
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is that difficult cause i am in no way a mechanic i know some more than basic things though so
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Unread 12-30-2010, 08:49 PM   #8
Fin_Reaper
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They both have a drain and a fill. Remove the oil drain bolts and fill bolts, after they're drained - replace the drain bolt, and fill with the proper fluid until fluid is level with the fill hole (i.e. you can't get anymore fluid in the fill hole...). You might have the remove the skid. An hand oil pump designed for a quart size makes the job much easier.
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Unread 12-30-2010, 09:58 PM   #9
MJMPC
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Remove the fill plug first. Dont help a bit if you take the drain plug out first and then cant get the fill plug out.
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Unread 12-30-2010, 10:18 PM   #10
Ross_YJ
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I had a bit of grinding/front knock recently and it turned out just to be my front shock stabilizer. It was shot and needed replaced. However, I also had my front axle seals recently redone due to gear oil being spit on the driver's side front tire. The seal was bad. Make sure that your gear oil fluid is up to par in your front diff's. If not you get grinding inside the pumpkin from the gears not being lubricated properly. Let this go long enough and you'll need an entire front end rebuild which is pricy. Gear oil is easy to check and the plug is right on the front of your pumpkin between the axles. Just a suggestion...
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Unread 12-30-2010, 10:24 PM   #11
parkerm26
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if your not mechanically inclined i would bring it to a mechanic. knowledge and know-how is alot cheaper than mechanics bills though. after this, i would consider heavy research on this forum to learn about the bits and pieces of your jeep. its saved me thousands being able to do repairs and upgrades myself. good luck
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Unread 12-31-2010, 10:36 AM   #12
91wranglerwilly
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so i greased the shafts and the u's real good idk if they did anything. i crawled underthe front and where is the drain or fill on the front same question for the back and transfer cas im gonna ask my neighbor who used have the same jeep
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Unread 12-31-2010, 09:44 PM   #13
BlueDanube
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Also, check to see if your front driveshaft happens to be rubbing against your exhaust.

If the exhaust is loose or out of adjustment at all, it doesn't take much for it to start rubbing.
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Unread 01-01-2011, 07:52 AM   #14
91wranglerwilly
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ill look but i tsounds like my tranny is grinding only when you hit the gas while driveing
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Unread 01-01-2011, 08:54 AM   #15
BlueDanube
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That's also why I said to check the exhaust. When the engine "torques" under a load, it can shift that pipe over an inch or two, causing it to rub the front shaft. Especially if the shaft itself has rust buildup on it (like most of them do).

I mostly brought this up because I found this on MY Jeep when I first got it. Took me a day or so to finally narrow the noise down to that, and it took that long just for the rust to rub off that section of the front shaft.
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