mikejr

Has anyone done the math on this? I'd be interested in seeing the geometric change in axle shift per inch of lift. I see guys all the time w/ a 2in BB claiming the axle shift is 1in, and others with much more claiming a smaller shift.

I've half a mind to measure ride hide distance between housing and frame, throw it on a lift and remove the tires, jack the diffs to the same ride height, and then back off an inch at a time and measure the change from the rotors to the frame...

ronjenx

The amount of shift per inch of lift will change from one vehicle to the next, depending on the starting angle of the track bar. And that depends on the springs and the weight of the vehicle.

jedg

Yep. This ^^^

Those folks are stating the advertised lift not the actual lift. As Ron said, that'll vary vehicle to vehicle.

Rednroll

Axle shift which way? The axles will shift left/right as well as front/back. Left/Right will be tied to the TB geometry, front/back will be tied to the control arm geometry

ronjenx

You are correct.
I assumed the OP meant left/right shift, as that seems to be the one most often addressed.

mikejr

Yep - left to right, the front to rear is a function of the radius of the CAs.
The difference between vehicles should be negligible (if it wasn't the amount of variance would be insignificant in terms of axle movement and it wouldn't even be a topic).

But w/ stock components, how far off center at full droop and full stuff?

TheDirtman

a^{2}+b^{2}=c^{2}
plug in the numbers for the link lengths and the amount of travel you are looking at.

ronjenx

fify

a² + b² = c²

I don't think it's that simple, though. There is a varying rate of decrease on one side.

14Sport

Both a and b are variable. Only the hypotenuse (track bar) remains consistent.

TheDirtman

How so?
You are just figuring the difference of one leg of a right triangle. C is a constant B is the amount the axle moves up and down, A shows the amount of shift.