I just installed a DJM flip kit (4" drop) on my 07 F150 2wd. I'm having a problem figuring out the correct way to adjust the driveline angle. I am experiencing a slight vibration while accelerating from a dead stop and I'm pretty sure it's because of the driveline being out of alignment.

When I first finished installing the kit, my driveline looked like this:

You can see that the driveshaft is out of alignment at the carrier bearing.

So, I loosened my ubolts and flip kit brackets and tilted the axel forward to try correcting the problem.
The driveshaft is straighter (not perfect) going through the carrier bearing but now it's out of alignment coming out of the rear differential:

Using this configuration, I still feel a vibration and now there's even a 'clunk' noise that I hear when I go over a bump.

It seems like if I would get a shorter carrier bearing spacer it would even everything out but this is only a 4" drop - it doesn't feel like it should be this hard...

Has anyone else had this issue or any ideas on how to correct it properly?

 

You need a carrier bearing relocation bracket if you have a 2 piece drive shaft. I used one with my 4" rear drop and I have no drive line vibration.

 

Well that explains it then... thanks!
I just ordered a carrier bearing relocator from Godfather Customs (http://www.gcustoms.com/product_info...ducts_id=13624) and I'll post back with results.

 

I do believe that is the exact same one I bought from them.