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Harmonic vibration at hwy speeds in 97 Ford Explorer

 
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  #8  
Old 11-06-2013, 09:20 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

Had a similar problem wiyh my F250...it turned out it was a stuck trunnion on the U joint in front of the carrier bearing. We didn't find it till we took the driveline completely out,also replaced carrier bearing since we had it out. my .0002 anyway.
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  #9  
Old 11-06-2013, 11:02 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

Quote:
Originally Posted by shorty View Post
+1 on the radio...Marshall Tucker Band and crank it up!
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  #10  
Old 11-07-2013, 12:59 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

Ford has some 'better ideas' like no grease trunions (U-joints) and other stuff, so does Chevy and Fiat-Chrysler, not just Ford. It's all about making it as cheaply as possible and selling it for the most profit, the American way.....

I still believe it's the tires but I'd be replacing the trunions anyway with Super U-Joints. They have a grease zerk.

I had to replace the upper and lower ball joints on my F350 (solid axle Dana 60) in the first 30,000 miles because they aren't greasable from the factory and they got wonky... Not a big deal, just time consuming. All have zerks now. Still a PITA to grease the uppers as there isn't sufficient room to leave the zerk in the upper without the axle trunion wiping it off, so it's a pull the plug, screw in a zerk, grease and remove and replace the plug.

Ford also puts a viscous dampener on the rear propeller shaft that sometimes gets wonky and that will set up a vibration as well. Problem is, thats a driveline specialist replacement as it's pressed on the propeller shaft. I'm on my 3rd carrier bearing in 90K miles. At least Ford sees fit to apply super slide blue to the splines.

It's nice owning a machine and fabrication shop. I replaced every suspension spring pivot with roller bearings and cross drilled securement pins with grease fittings and flipped the front springs so the swing shackle is in the rear instead of the front.... Ford did that on subsequent Super Duty trucks, must have looked at mine...lol Still rides like a lumber wagon, it's a one ton so I don't expect a Caddilac ride but at least you can drive down the road without things flying around in the cab.

One thing I forgot to mention is that you have to 'time' the driveline if you remove any component for replacement/rebuilding. The easiest way is to pre-mark each section with a paint marker so when you reinstall it, you can line everything up. If you don't, it will vibrate at speed. If you had it apart and never marked it, it's easy to tell if it's 'timed' by looking at the position of each trunion. Each trunion starting from the back differential has to be at a 90 degree relationship to the next one (looking at the outer knuckles). They can't run parallel, they will vibrate. opposing knuckles cancel any imbalance.

Finally, make sure the weight tab is on each section. There will be a spot welded on weight tab on each tube from the factory and when working on a drive shaft, it's easy to knock it off. If it's gone, the driveline will vibrate. If it is missing, you'll have to have that section harmonically balanced at a driveline shop.

Keep in midn that if you have say, a 3.55-1 final drive, that driveline is turning 3.55 revolutions to turn the tires 1 revolution. That baby (driveline) is whipping around under there at 65 per.

I just muddied the water a bit.....
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  #11  
Old 11-07-2013, 02:01 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

Thanks, SidecarFlip. I went to a driveline specialist in town today who drove it and thinks it's the u-joints. 180K with original, non greasable, u-joints. I've replaced Ford u-joints in the past and have thought to my self that the reason I'm replacing this is because it was non-greasable...arrgghh. They'll pull the driveline Monday and go through everything. I've thought about u-joints for a year, but 2 garages have told me they are fine. A specialist has a little different take on things, however.

You have done some serious work on that 350. Pretty cool to be owner of a shop and do that stuff.
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  #12  
Old 11-07-2013, 04:18 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

a thought on U-joints with and without fittings from recent experience;

My Chevy blazer (02) had rear drive U-joints replaced last fall after approximately 245k miles on the OEM parts. We used the type with grease fittings as replacements. They were done (worn out) by June. In their short life they were greased twice; once upon installation and again in the middle of the winter during a oil change and lube.


When the failure happened in June, naturally, I wasn't anywhere near home. But the repair station a block away from the breakdown was a 4WD and off-road specialty shop. They used fitting-less U-joints to effect the repair.

When I questioned the selection and the owner of the shop showed me several of the vehicles in the yard, all had fitting-less U-joints. Some of these vehicles were road worthy and others were strictly off road. All were considerably more heavy duty than my little Chevy. Chris' explained to me that the Zerk fitting that allowed the U-joint to be greased also allowed dirt and water to infiltrate thereby accelerating the next failure. This could be avoided, or at least minimized by weekly lubrication BUT who's gonna' do that?

A buddy had a similar situation with his Dodge 3500. He does a lot of towing with a construction trailer too. The cheap parts failed in weeks. The better parts lasted longer but still failed in a month or two. Then he replaced with fitting-less and that was 2 years ago. still going.

jmden, ask your driveline guy about this if the work hasn't been done yet.

Pete
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  #13  
Old 11-07-2013, 04:45 PM
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Re: Harmonic vibration at hwy speeds in 97 Ford Explorer

Good point. I'll make sure and look into that. Thanx.

Quote:
Originally Posted by Wile E Coyote View Post
a thought on U-joints with and without fittings from recent experience;

My Chevy blazer (02) had rear drive U-joints replaced last fall after approximately 245k miles on the OEM parts. We used the type with grease fittings as replacements. They were done (worn out) by June. In their short life they were greased twice; once upon installation and again in the middle of the winter during a oil change and lube.


When the failure happened in June, naturally, I wasn't anywhere near home. But the repair station a block away from the breakdown was a 4WD and off-road specialty shop. They used fitting-less U-joints to effect the repair.

When I questioned the selection and the owner of the shop showed me several of the vehicles in the yard, all had fitting-less U-joints. Some of these vehicles were road worthy and others were strictly off road. All were considerably more heavy duty than my little Chevy. Chris' explained to me that the Zerk fitting that allowed the U-joint to be greased also allowed dirt and water to infiltrate thereby accelerating the next failure. This could be avoided, or at least minimized by weekly lubrication BUT who's gonna' do that?

A buddy had a similar situation with his Dodge 3500. He does a lot of towing with a construction trailer too. The cheap parts failed in weeks. The better parts lasted longer but still failed in a month or two. Then he replaced with fitting-less and that was 2 years ago. still going.

jmden, ask your driveline guy about this if the work hasn't been done yet.

Pete
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In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl
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