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Discussion Starter · #1 ·
I purchased a 2000 7.3 Ex with 93k miles and 4X4 Limited about 4 weeks ago. I knew it needed ball joints, windshield and Rt passenger door lock actuator. I replaced the windshield and have a slight whistle (I think I know what it is), replaced the actuator (that is working well) and had Spiner professional upper and lower balljoints installed as well as new shocks. I still have a bumping sound in the front when I drive over bumps. The steering is much better with the new balljoints and I don't feel the bumping sound in the steering, but the bumping sound is bothering me. I took it back to the mechanic to take a look and he isn't sure what it is. The sway bar can slide a little in its bushings, but not enough to make the sound. The sound comes from under both of the front floor pans at different times depending on the road. The stop bumpers are gone and I am sure the front springs are sagging. The front rear leaf spring mounts are facing rearward and about 3/4" away from hitting the frame. I think this could be the area the sound is coming from. I don't see a dent in the frame from them hitting, but there is a small mark. Please help with any experience on this bumping issue. This is my first post and my first diesel.


I was planning on updating the front springs to at least V code (see I did my homework here), or maybe X, not sure, but want to find the problem first. I would like to eventually install at least 33' tires. The truck has a Hypertech programmer III installed. Gas mileage around town says 19 and I've gotten 27 on the highway when cruising. I am not sure if it is correct though. I am tossing around a new air intake and maybe a better flowing muffler.
 

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27 on the highway sounds a bit high, I can get 22-23 on the highway, and I feel I'm doing damn good.

Check your sway bar links and bushings, even a slight movement is enough to make that noise on our trucks. Swap bar shouldn't be able to move at all. 93k it wouldn't hurt to replace them anyways as preventive maint. I believe this will solve your problem. It did on mine.
 

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99% SURE ITS THE TRACK BAR EITHER THE BUSHINGS ARE BAD OR ITS LOOSE
 

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Discussion Starter · #4 ·
The front sway bar does move from side to side easily in it's bushings. I was hoping that's what it was.

I got 27 on the highway when I reset the computer already going 60mph. It stayed there until, of course, I got into town.

I am using a Hypertech III programmer set to it's third mode and hard shift for the trans. I am thinking about changing the muffler to the Mac and getting an good air intake.

Thanks for the comments. I need to do springs too.
 

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I went through clunk issues on my newly purchased 02 Ex with 95k a while back.

I found bad ball-joints, hub assy and bottom shock bolts too small. It is clunk free now.
 

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Stereo: Your not the only one with this problem. My truck has 266k miles on her, with new ball joints and shocks. But that bumping sounds is still there. Sounds like your church shoes in a shoe box.
 

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Discussion Starter · #7 ·
That's the sound! I don't feel it in the steering, but I can hear it and feel it in the front of the floor boards. I'm going to get those new bushings and see what happens. I reprogrammed it to the third stage Hypertec has and it moves pretty good. If I tromp on it it will blow a little smoke. I have a 2003 Dodge Hemi 4X4 quad cab and not sure if I should sell the Dodge of the Ex. I just got the Ex 4 weeks ago to save on some fuel. The Hemi is getting 11.2, I am not sure if the gage on the Ex is right yet.
 

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Pull the front shocks off and drive around the block.


It won't cost a dime and doesn't take much time.
 

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Discussion Starter · #9 ·
I just put new Reflex shocks on it. Do you think they could be contributing? I ran that thought in the beginning, thinking if the springs were sagging then maybe the shocks are close to their min travel area.
 

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It can't hurt to take them off for a short drive. You can eliminate them or know it is the problem.
 

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FWIW, the MPG meter, (depending on the programmer) will outright lie to your face. When I did what you described, reset it at 60 and left it there, I acheived over 30mpg according to the lie-o-meter. Hand calculated, I got more like 18.5 on a tank of all highway driving. (I have a 6.0, so you should get slightly higher than that.)
 

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Discussion Starter · #12 ·
I am going to find out soon. I reset the trip meter when I filled up. I also found the speedo is wrong. When I am doing 40 the speedo says 42. I drove past a few of those digital speed do-hickies that are on the sides of the road. A few different ones show my speedo is low by 2 to 3 miles an hour. This also makes my gas mileage appear better.
 

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Fix the clunk yet?
 

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I had that. We replaced the sway bar/bushings and added a steering stabilizer. It's never come back.

Oh MY! I just saw you sold the truck :dunno:
I hope your happy with what you got...I wouldn't give my EX up for anything in the world!
 
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