Help diagnose rear wheel wobble

[pacecarta]

what your missing as to why is that the splined end of the shaft is pressed into the side gear , that gear can be wobbled (cocked) by the axle as its slid into the outer wheel bearing (bearings are flat rollers but axle end is tapered coming into to the bearing surface area) when the tube isnt perfectly centered and as the car moves the center section rotates and the spider gears follow as the spider gear gets to the postion where the side gear was cocked (even though spider and side arent rotating) it forces the side gear back which causes the axle to bend and after spider gear passes by it releases that pressure and the side gear cocks again and does this twice with every rotation of the ring gear at that point the axle is flexing away like a spring and tire magnifies the flex and wobbles , how severe tube needs to be bent before its a problem depends on condition of side gear , axle fit in the side gear as well as axle strength
with slight bent tubes the axle splines have enough play (or wore in enough play) in the side gear that it dosnt cause the side gear to be cocked


like i said the tubes bend and usually are bent and when upgrading axles you can find the axle needs a push to engage the side gear , most would overlook this but that a sign the tube is bent and excessive and should be straightened , the axles should slide freely into the side gears