Post Lift Install Vibration

[scrappyisbe]

Aren't the specs in the Ford TSB for non-lifted/stock trucks. Wouldn't it be different for lifted trucks?
Or is the goal to maintain that angle, regardless of the lift?

You cannot maintain angles and lift the truck. They will increase, all you can do is spread them evenly over all joints and make them cancel out like it was stock.

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[Jason B]

Kind of what I thought. It seems to me that the angle of the pinion relative to level won't change as the truck is lifted, but the angle of the pinion relative to the drive shaft will.

 

[scrappyisbe]

Kind of what I thought. It seems to me that the angle of the pinion relative to level won't change as the truck is lifted, but the angle of the pinion relative to the drive shaft will.

The angles of both joints on the aft driveshaft will increase unless your lift blocks are tapered or you lower the carrier bearing. But lowering the carrier bearing will increase the front joint angle. Did you check to see if your blocks are tapered? And that they aren't backwards? If they are backwards, it will make the problem worse by increasing the angles more.

 

[Jason B]

The angles of both joints on the aft driveshaft will increase unless your lift blocks are tapered or you lower the carrier bearing. But lowering the carrier bearing will increase the front joint angle. Did you check to see if your blocks are tapered? And that they aren't backwards? If they are backwards, it will make the problem worse by increasing the angles more.

Not me. I plan on a 2 - 2 1/2" level but won't be doing anything to the rear. Rough Country came out with a 3 1/2" lift, with new UCAs, diff drop, and rear axle blocks. That's too much for me, even though the price is good.

 

[scubajosh77]

The angles of both joints on the aft driveshaft will increase unless your lift blocks are tapered or you lower the carrier bearing. But lowering the carrier bearing will increase the front joint angle. Did you check to see if your blocks are tapered? And that they aren't backwards? If they are backwards, it will make the problem worse by increasing the angles more.

Blocks are not tapered

 

[scubajosh77]

Aren't the specs in the Ford TSB for non-lifted/stock trucks. Wouldn't it be different for lifted trucks?
Or is the goal to maintain that angle, regardless of the lift?

That's a fantastic question. I don't know. I'm not a suspension expert. My plan is to install the spacers incrementally via trial and error to see if/when the vibration goes away.

 

[scubajosh77]

So finally got the spacers installed. Very easy. I don’t think the vibration is completely gone but it is much better. I’m satisfied.

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