04 F-350 hopping at 68 mph - Ford Powerstroke Diesel Forum
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Old 12-17-2009, 05:52 PM
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04 F-350 hopping at 68 mph

I have a 04 F-350 when I'm going down the highway and hit 68 mph my truck starts hoping like the back end is trying to catch up to the front end. I have working on many Fords. So I know quit a bit about them. Have checked u-bolts, tie rod ends, ball joints r good. Just put a new carrier bearing on the drive shaft. Check the drive shaft for a weight gone and all the u-joints. the sway bar had new bushings put in this summer and a front end alignment. I had my summer tires on when it start, which r 37x12.5. Then I switched my other tires which r 35, whiched ruled out broken cords. To give u more of an idea what I have, 8 inch bds lift kit with boudle shocks on front, double shocks on steering, drop block on the drive shaft.

Last edited by 96crewcab; 12-17-2009 at 07:02 PM.
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Old 12-18-2009, 01:51 AM
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You may want to get the tranny checked, we have one that shifts in and out of gear at 71 mph. Makes it seems like it takes a hop. Origional code was a bad vss sensor but it still did it after you drove over 15 miles. It is at the tranny shop now no word back on it yet. Sorry I don;t have better info.
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Old 01-05-2010, 06:27 PM
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Wouldn't u see the rpms jumping up and down though? My rpm's don't move a bit when it does it. I'm leaning towards a bent or twisted drive shaft.
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Old 01-05-2010, 07:43 PM
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I would think a bent or twisted driveshaft would do it more often that just a certain speed. I would get the tranny looked at it could be slipping enough that you couldnt notice on a tach. try using the odometer test and watch your RPM's it gives a digital reading. the only other thing i could think of is a throttle position sensor but it would act up no matter what speed your at also.
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Old 01-10-2010, 03:29 PM
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Taking my driveshaft off this week when the studs and egr it is getting put on. Going to get a new spline and balanced.
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Old 01-12-2010, 05:37 PM
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Check the balance on your tires. If the rims clock on the studs, it will be out of balance.
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Old 02-13-2010, 04:57 AM
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Thought i would let everyone know what I found was wrong on my truck. The problem was the injector control module. Dealership saw that it wasn't putting out the volts that was suppose to. Thanks for all the help.
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