knezat225

OKAY I HAVE A 2007 F150 WITH A RIZE 8" STACKED TO 10.5" AND THE REAR IS PERFECTLY LEVEL WITH THE FRONT. I HAVE NATIONAL LEAF PACKS AND RIZE 6" BLOCKS AND 4 DEGREE SHIM IN THE BACK. Local drive line shop installed shim and made me a new driveshaft. Allthough my truck isn't vibrating as bad it still has a slight vibration. What can I do to fix this?

knezat225

06F150CFCT

Might have to do with the 6" block. I have a 5" one and have a slight vibration bit I just deal with it. I also need to get mine shimmed like you did though. You might want to look at just getting a set of 10" springs made. Not the most cost effective but it will cut down on the vinration/axle wrap.

knezat225

Why would that make so much vibration?

Flintlock

WOW! Sweet Truck! Good luck with it. Hope you find the problem....

06F150CFCT

Axle wrap..causes the chattering. When you press the gas the rear leafs want to bend in an "S" and it is opposite the way your truck wants to move. So in essence you leafs are fighting your truck because one wants to go one way and the other another way.
That is just the general jist of it but you can look up axle wrap on google to get the technical definition.
Having a 6" block placed in between the leafs and axle is just giving more room for the leafs to move and contort. That is why it is best to just have the leafs sitting directly on the axle. less room for them to move.

06F150CFCT

I mean it could be you have bad U-joints or just need beefier ones but I would assume the driveline shop accounted for them when they did your setup.

Jerhelo

Sounds like your drive shaft is not properly balanced, take it in an have them check it out, Happened on my Tacoma's custom drive shaft...Not a big deal, quick fix but it sounds like it either that or the pinion has to much shim, you should keep the pinion angle and slip yoke out put angle as close as possible. This is where I would start...

Rider4life350

I'm new to trucks but can't you do a transfer case drop like in jeeps?

ADUB23

Might want to look into some traction bars.