Shutter down the highway...sometimes - Ford Powerstroke Diesel Forum
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Old 03-16-2011, 05:05 PM
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Shutter down the highway...sometimes

It started about a week ago, my truck will kinda shutter like riding on a rough surface driving on the highway. The thing is, it doesn't always do it. It will start shaking the truck very slightly going down the road and then it will quit only to eventually start doing it again. This is the highway I take every day to work and it never did it before, used to cruise nicely. I ordered a black CPS thinking this was the problem, its not here yet but I figured that its not a bad idea to have a spare one on hand anyway. I can also feel a clunk when I come to a stop and then start going again, thought maybe it could be related. The clunk feels like the rear end or maybe tranny, not sure. Any insight would be greatly appreciated!
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Old 03-16-2011, 06:03 PM
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Get under your rig and check all u-joints from the rear end to the front end and all in between. More than likely you have a u-joint out or going out. Check the torque on all four wheels also. Most people forget to check and re-check lug nuts. If you have a chance you might get your tires re-balanced also. It's gotta be 24 hwy. That's a mean ride out there

Last edited by EArmsF350; 03-16-2011 at 06:07 PM.
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Old 03-17-2011, 03:01 PM
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Checked the u-joints after work, they're good. Checked the torque on wheels and they are still at 150 lbs/ft which is as high as my torque wrench will go. I did notice in neutral the rear driveshaft can be turned back and forth a little, could this be my clunk? I don't have a carrier bearing as I have an early 99. Truck still shuttered on drive home today, but only occasionally.
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Old 03-17-2011, 08:13 PM
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does the truck shutter on or off the throttle or both, my old truck did the same thing when it was in od and light throttle. it was the torque converter added some conditioner the tranny shop had and it was fine, that is if it is even an auto
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Old 03-18-2011, 03:34 AM
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Yea, its an auto. It seems to do it both on the throttle and off, and yes in OD. Do you remember what that conditioner was? EArmsF350, Close but not quite Hwy 24! I head down 77 South to Junk town!
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Old 03-18-2011, 08:46 AM
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I don't remember the name but when I explained it to the local tranny shop he knew exactly what I was talking about and had the stuff in stock. You can also try throwing some lucus in there im pretty sure that has an additive or conditioner in it

Sent from my ADR6300 using AutoGuide App
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Old 03-19-2011, 02:32 PM
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Put the new "Black" International CPS in, seems to idle a little better can't really tell a difference other than that so far. Also today, added some Lubegard Automatic Transmission Protectant that is supposed to help shifting and reduce shutter. Put a new rear brake caliper on too, the old one started dragging on the rotor heating things up. Hopefully one or all of these things will cure my shuttering! Thanks to all for the help, I'll post results in a few days to let you know if it's fixed. Is it normal that I can turn my drive shaft back and forth a little in nuetral?
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Old 03-19-2011, 05:10 PM
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some play is how its suppose to be its call backlash
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Old 03-21-2011, 02:34 PM
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Well, absolutely no shutter to and from work today! The ride is nice and smooth again. Thanks to all for the help!! I think the 9$ bottle of lubegard did the trick, but the truck seems to idle alot better after the CPS, no fluctuations in idle. Also did the HPX yesterday and seems to make it idle even better yet. Thanks again!
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