16LariatFx4

I was wrong above. They said that when the front DS is out that the hubs are still activating. Vacuum is at 23 lbs which seems to be okay based on a similar truck that is working fine.

tareed94

The hubs are active unless there's a vacuum pulled on them. Have them test the vacuum with it in 2wd, 4wd, and then do the same on the other truck. I have a REALLY hard time believing your front driveshaft has gone bad due to the lift.

Havyek

Shorter springs, remove any spacers that were installed. . .
My lift experience is with Jeeps not the new F150s, others with more knowledge will likely chime in.

I'm still surprised that the front shaft would be causing the vibration though. In the Jeep world, the rear shaft is usually the culprit because it's so much shorter than the front, lifts change its angles much more severely than the front.

tareed94

What is the lift kit manufacturer saying? If nobody has contacted them then that's a mistake. They should be included in the trouble shooting process, and would likely know a solution very quickly.

16LariatFx4

They have been a part of it with the 4x4 shop. They also had another Ford dealership helping with ideas but that was all videos and over the phone. That dealership is 45 miles away from me. The shop has called them to see what should be done next or if it should go to them (they supposedly don't blame lifts for problems). Only issue there is the distance and rental car that I will be stuck paying for until its fixed. Two weeks without my truck so far.

tareed94

Screw paying for a rental car! The 4x4 shop is the one that messed it up, they should be covering a rental car.

16LariatFx4

Service manager from dealership called me today to explain. They said that the angle where the front drive shaft connects to transfer case is where the angle is bad. The said something about a ball type joint (or something like that. I could be off) is on that top side and if the ball isn't right, usually due to angle, it will cause a wobble (my technical term) in the DS.


My 4x4 shop has the truck back and is checking the angles and verifying some stuff with the lift manufacturer. Supposed to have some info in the next couple of hours and hoping that my DS is not hosed. If so, I would hope that either the shop or the lift manufacturer take care of it.

greasyknuckles

probably has a double cardan joint. basically 2 u-joints at one end with a ball
and socket swivel connection between them.

16LariatFx4

yesterdays answer was to install the 2017 kit on my 2016 but whatever.
talked to the shop who said that the angle on the front DS was slightly better but he still felt the reported problem in the steering wheel.


asked them to get the truck up off of the ground and watch the front DS again to see if it is still wobbly and if so to find another one and put it on and keep it in the air to see if it still wobbles. also asked for them to measure the angles and report this to the lift manufacturer to see where to go from there.


only problem I can see with checking for DS wobble while off the ground is the suspension geometry wont be right with the suspension hanging which may look like a problem that doesn't exist when all 4 wheels are on the ground.

16LariatFx4

2017 kit made angles appear to be better.


still have a problem though. still not riding correctly. shop manager drove it both in 4h and 2wd and the same exact thing feeling through the gas pedal and the steering wheel is felt.


how does the transfer case work? Is it always sending "power" to the front diff or is that part of what the switch does (releases vacuum and engages front drive shaft?) or does the switch only release vacuum causing the hubs to engage?


could this be something wrong with the transfer case, or switch or relay, where even though the switch is not in the 4h position that it thinks it is for some reason?


again, I'm a 4wd newb and have no idea how everything works under the truck.