I've been thinking about how to set the adjustable front and rear panhards, but didn't figure it out until after I put the lift on. I was hoping someone might could measure the stock panhard rod angles at stock ride height to help confirm. If the baseline angle and rod lengths are known, I think the correct new length can be calculated precisely as follows:
stock rear panhard length: 31.75" (ctr to ctr of bolt holes taken from search)
stock panhard angle: 10 deg (guessing for now)
rear lift height: measured on truck at 2.75" over stock
new panhard rod length calculation using right triangle maths:
31.75" * sin(10deg) = 5.513" (height between stock mounting bolts)
(31.75^2 - 5.513^2)^0.5 = 31.268" (horizontal distance between stock mounting bolts)
5.427" + 2.75" lift = 8.177" (lifted height between stock mounting bolts)
new panhard length required = (8.177^2 + 31.268^2)^0.5 = 31.268" or 0.482" longer than stock
I only adjusted mine to be about 1/8" longer, and the axle was pretty well centered, so I'm guessing the stock rod angle is smaller than 10deg.
stock rear panhard length: 31.75" (ctr to ctr of bolt holes taken from search)
stock panhard angle: 10 deg (guessing for now)
rear lift height: measured on truck at 2.75" over stock
new panhard rod length calculation using right triangle maths:
31.75" * sin(10deg) = 5.513" (height between stock mounting bolts)
(31.75^2 - 5.513^2)^0.5 = 31.268" (horizontal distance between stock mounting bolts)
5.427" + 2.75" lift = 8.177" (lifted height between stock mounting bolts)
new panhard length required = (8.177^2 + 31.268^2)^0.5 = 31.268" or 0.482" longer than stock
I only adjusted mine to be about 1/8" longer, and the axle was pretty well centered, so I'm guessing the stock rod angle is smaller than 10deg.