Trouble centering axle with track bars

[Tob]

Possibly, but here is where the bumper jumping actually can help.

Before you center the axle loosen the bolts on the control arms. Use the ratchet strap method to get it centered, set the track bar to length and bolt it in. Then jump on the bumper some. Then torque everything down.

Why loosen control arm bolts?

 

[Fouledplugs]

Hard to not advocate for this:
https://wranglertjforum.com/threads/how-to-align-your-axle-with-an-adjustable-track-bar.16623/

 

[WallyWest]

Why loosen control arm bolts?

So that they don't bind up while you're moving the axle around. And so once it's settled into ride height the joints aren't preloaded.

Forget that if you have johnny joints, they don't bind up just from moving them around.

 

[JMT]

I used blaines pistol method linked to above @DylanM345