Vibration problem

[Lethal03PS]

Thanks maybe im not an idiot after all...haha

[krazeehorse]

I would say most FX4 do not have a carrier bearing as the drive shafts aren't that long.

[arodrigues]

my fx4 has the carrier bearing its an extended cab long box. i think the one piece drive shaft was on the extended cab short box and the red cab long box from what i have heard from other people

[Evil Eye]

Originally Posted by arodrigues

my fx4 has the carrier bearing its an extended cab long box. i think the one piece drive shaft was on the extended cab short box and the red cab long box from what i have heard from other people

Oh, I didn't even think to check. I am pretty sure you're right!

[Lethal03PS]

yeah, that must be it. I have an ex. cab short box. Since its not that, now what?

[Evil Eye]

Here's something that might help. I know its pretty long, but it might help.

[JBakerFX4]

Start with a $10 angle finder and check condition of U joints and carrier. Block in general suck. Any block taller than the OEM F350 block is asking for trouble. Especially those mall crawlers running 8" lifts with stacked blocks. I laugh.

[Lethal03PS]

Ill go over it all. I have a lot of information now. I just have to find time to go over everything. I didnt realize that there was this much stuff. Thanks for all the help..

[Lethal03PS]

OK so here is where im at now. I talked to a buddy of mine and the told me to drop the driveshaft and check the angles. I was out 1/2 a degree from dead strait. He said to allow 3 degrees for when the driveshaft moves up with the throttle. I guess from what he said it that I need a 3 or 4 degree shim under the blocks on the rear axle and that should take care of it. Does that sound right. Do anyone think this is the cause of the vibration.

[OverFueled's_08_Fx4]

Just a thought, You do have a lift kit under it for the 35's?? Blocks in the rear?? If so, could it be they are oriented in the wrong direction. Most lift kit blocks are degree'd to compensate for the lift. If they are in wrong it will throw the angles off and cause a weird vibration. I was thinking about rear end pitch along with some other things while reading this post.