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Discussion Starter #1
I posted this on another forum...hopefully you'll be able to help me :)

I have a 2001 XLT with a 4.0 V6 SOHC and it has developed a pretty bad vibration when accelerating. I bought the truck in December of 2016 and the only issues with it were the thermostat being stuck open and the 4X4 lights were flashing. Well I disconnected the battery and got the 4X4 lights to stop flashing and you can hear the transfer case switching from High to Low. Then when I went to replace the thermostat, I had to remove the throttle body and the MAF hose to get to the housing of the thermostat. Once I got that all swapped out and put back together, the truck wouldn't start. I took it apart and put it together a few times and finally I got it to start but it ran rough and would die if it idled too long(it's still kind of sluggish but doesn't really die now unless it's cold). Well anyways after all that happened, my ex. started vibrating when accelerating, sometimes it's noticeable and you can feel it throughout the floor, then some days it's really bad where the dash and seats start rattling and so does the back end. I also noticed with this vibration that the side and sometimes rear view mirror shake so bad that you see the headlights of other vehicles behind me trailing. Everyone that rides with me says they can feel it in the passenger side floor. I initially thought maybe I had a vacuum leak due to the fact I took the MAF hose off or maybe the throttle body position was altered some how when I took it off. I took the truck into my local Sears Automotive since they do free estimates and they barely had it for 10 mins and told me that my rear axle seal is leaking which is causing my rear differential to go bad but they weren't too sure because they don't repair that there. So I don't have a clue what is going on with my ex. It does have the CEL on but the guys at Autozone said it's on because of my gas cap. I find it kind of weird that this vibration started happening after removing the MAF and Throttle Body but just my luck something else could have went wrong. I also thought maybe the 4X4 wasn't disengaging properly since it wasn't working when I got the truck so I disconnected the transfer case motor and it still has the vibration. Any ideas what could be wrong?


Thanks much!
 

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Check the driveshafts then axles for play there most likely the problem. If there good trans and diff's next most likely trans there horrible in the 4.0s I've replaced more then 20 in my whole career could maybe be torque converter but I've only seen one ever go bad
 

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Discussion Starter #3
I was tinkering around with the explorer yesterday and I took off the 4X4 transfer case motor because when I bought it, the 4WD lights would blink 6 times every couple of minutes until I disconnected the battery, then it seemed to shift into 4x4 okay. I noticed even though my dash switch is the the Auto mode, the transfer case was in 4X4 high even though the roads are dry so I was wondering if maybe this is causing excessive wear and tear on the front end? I grabbed the front driveshaft and i could freely rotate it. Is there supposed to be any play on the drive shaft? It was pretty easy to move.
 
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