Vibration problem

[boots16]

if you got the truck right there with you, get under there grab the drive shaft and if you can twist (move) it with your hands its one of your u-joints. it takes but 2min to rule that one out.

good luck

[Lethal03PS]

Thanks ill give it a try!

[arodrigues]

thats what i did. it was caused by the engine being set off balance at the speed and vibation.have them to the injector test on it

[Lethal03PS]

OK did an injector test and it checked out ok. So its not that. I was thinking maybe along the lines of the carrier bearing shims. My trucks lifted and I dont know if the last owner put shims in it. Is there any way to check? I cant seem to find the carrier bearing.

[GGOODMAN]

the nice joint in the driveshaft just after the cab, thats where the carrier bearing is. it carries the drive shaft. if it's been shimmed there will be either one or a combination of plates droping it away from a cross member.

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Last edited by GGOODMAN : 07-09-2008 at 10:59 AM.

[krazeehorse]

If you go above the speed where it is worst and coast down through those speeds does it still vibrate? (you said it is worse under load). If it doesn't vibrate as bad coasting down through then try it again coasting with the tranny in neutral. If it's different with the tranny in neutral (noticebly better or worse) then my suspicions would be U-joints or other drive shaft problem.

[Lethal03PS]

Yes it still vibrates in neutral while coasting. I cant seem to find this carrier bearing anywhere... I look around the driveshaft. Would it be under one of my skid plates. Is it close to the 2 u joints right at the beginning of the driveshaft.

[Evil Eye]

The carrier bearing is in between the two halves of the drive shaft. The pic shows the two arrows pointing at the two drive shafts with the carrier bearing in between.

[Lethal03PS]

Yeah I can see it in the picture but not on my truck. My driveshaft is in one piece, with 3 u joints. Two up close to the transfer case and one right before the differential. I dont get it. Should I have 2 drive shafts? Why cant I find this thing. I feel like an idiot. Does anyone have a picture of the bottom of the truck showing the carrier bearing?

[arodrigues]

some ford only had one drive shaft it depends on cab size and box size i think