PabloCruise
SILVER Star
I am writing about my '78 FJ-40
It has a 4 inch lift and 60 series PS
I am running 33x12.50 BFG MT's
I have run it like this for well over a year and all was mostly fine. She would find the ruts in the road and the steering was a little darty.
Alignment shop checked caster and found I was about negative 1 degree on both sides.
I ordered up some 4 degree shims from Roger Brown and just finished putting them in.
I also went with some nicer u-bolt skid plates that won't taco when I bounce on a rock.
I also switched the bushings that go in the front spring hanger to get my shackles to hang parallel.
I took the 40 out for a drive. All was fine until I hit a RR track crossing and started feeling a little shimmy that quickly escalated into what I believe people call the "death wobble". Applying the brakes did very little good, it felt like it was shaking itself to pieces
I had NO problem with death wobble before this, even with neg caster. I would run this rig up to 70 MPH with no problem.
Now, one day later, I am afraid that I just f*cked up and won't be able to make Cruise Moab.
After reading, I am suspecting three sources for this:
-Center pin torque
-U-bolt torque
-Shackle bolt torque?
Can anyone offer their experience to me on this? If I don't have to pull the U-bolt plates, I'd rather not if the center pin torque is not all that important.
I know u-bolt torque is important, I did not check tightness with a torque wrench.
How important is the tightness of the shackle bolts? I thought you did not want them too tight, so you can flex.
These are the same tires I have been running for at least a year and a half with no problems. The only things I have changed are the shims, u-bolt plates, and bushings.
HELP PLEASE!!!
It has a 4 inch lift and 60 series PS
I am running 33x12.50 BFG MT's
I have run it like this for well over a year and all was mostly fine. She would find the ruts in the road and the steering was a little darty.
Alignment shop checked caster and found I was about negative 1 degree on both sides.
I ordered up some 4 degree shims from Roger Brown and just finished putting them in.
I also went with some nicer u-bolt skid plates that won't taco when I bounce on a rock.
I also switched the bushings that go in the front spring hanger to get my shackles to hang parallel.
I took the 40 out for a drive. All was fine until I hit a RR track crossing and started feeling a little shimmy that quickly escalated into what I believe people call the "death wobble". Applying the brakes did very little good, it felt like it was shaking itself to pieces
I had NO problem with death wobble before this, even with neg caster. I would run this rig up to 70 MPH with no problem.
Now, one day later, I am afraid that I just f*cked up and won't be able to make Cruise Moab.
After reading, I am suspecting three sources for this:
-Center pin torque
-U-bolt torque
-Shackle bolt torque?
Can anyone offer their experience to me on this? If I don't have to pull the U-bolt plates, I'd rather not if the center pin torque is not all that important.
I know u-bolt torque is important, I did not check tightness with a torque wrench.
How important is the tightness of the shackle bolts? I thought you did not want them too tight, so you can flex.
These are the same tires I have been running for at least a year and a half with no problems. The only things I have changed are the shims, u-bolt plates, and bushings.
HELP PLEASE!!!
