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Old 12-15-2007, 02:32 PM   #1
Windowsrookie
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Changed diff fluid, now jerking!

Ok, just a half hour ago I sucked out the old diff fluid in the front and back of my GC (going to pop off the diff covers and change completely this summer). I put 80w90 in the front, and 85w140 in the back. Now I took it for a drive around a couple blocks and it was all good for 2 or 3 blocks. It then started jerking when taking off from stop signs. Then on the hill on the way back there was alot of jerking and the engine killed. I got it started again and brought her home, jerking at the 2 or the stops signs on the way back. What did I do?
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Old 12-15-2007, 02:47 PM   #2
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Its hard to say exactly but if I had to guess something just happened to fail at the time after you did the change. I really have no clue what it is, can you give a more specific description of whats going on, maybe some sounds, feelings, etc.
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Old 12-15-2007, 02:53 PM   #3
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It doesn't seem to be making any sound. Just when leaving stop signs it will jerk and vibrate. Then going down the hill it killed the engine.
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Old 12-15-2007, 02:56 PM   #4
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Does it feel like the brakes are being applied on and off?
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Old 12-15-2007, 02:57 PM   #5
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No, it's not the brakes. It feels like gears slipping.
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Old 12-15-2007, 03:00 PM   #6
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It has nothing to do with the diff oil change but must be something else. How is the transfer case atf level ?
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Old 12-15-2007, 03:01 PM   #7
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I bought ATF+4 to put in the transfer case but I don't have a big enough wrench to get the drain and fill plugs off. (Gonna borrow one from a friend).

Would lack of friction modifier in the rear diff cause jerking?
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Old 12-15-2007, 03:05 PM   #8
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Quote:
Originally Posted by Windowsrookie
No, it's not the brakes. It feels like gears slipping.
I'm aware of this I'm just trying to get a sense of the feel of the jerking. Is it a harsh bang or a more gradual accel/deccel.
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Old 12-15-2007, 03:08 PM   #9
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It's just a vibration feeling until I get up to speed. No harsh bang.
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Old 12-15-2007, 03:28 PM   #10
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Ok, went to move it into the garage and it took a long time to start. Like 20+ seconds. What the hell is going on?
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Old 12-15-2007, 03:32 PM   #11
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check to see if any engine codes were stored.. like a misfire or something.

Mess with anything else while you were under there?
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Old 12-15-2007, 03:36 PM   #12
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Quote:
Originally Posted by -Joe-
check to see if any engine codes were stored.. like a misfire or something.

Mess with anything else while you were under there?
I was going to change the engine oil, but drain screw is on so freaking tight i couldn't get it off. I hit the wrench a few times to try and get the drain screw loose but it wouldn't budge. Other wise no, all i did was put new diff fluid in.
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Old 12-15-2007, 03:49 PM   #13
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Anybody? Would the lack of friction modifier cause the vibration? Would the vibration cause the engine to kill?
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Old 12-15-2007, 03:54 PM   #14
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humor us and check the codes..

jerking when accelerating sounds engine related not driveline related unless you making sharp turns
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Old 12-15-2007, 04:40 PM   #15
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I bought friction modifier from the dealership. Do I put the whole 4oz bottle in the rear diff?
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