So after a 63" spring under and 14 bolt SF 6 lug swap in the rear,

[BlaZeus]

On my 81 k5 with stock front suspension and a 350 motor and auto trans, I get a really bad death wobble around 30-40 mph. And then it goes away around 55-60. But usually i slow down and it lasts until I come to a complete stop. What could be the problem? I have redone the rear suspension 3-4 times and it hasn't gone away. I am now turning to the front end and wondering if something up front might be causing a problem? The spring under is causing the truck to sit really low in the rear and I adjusted rear axle pinion angle accordingly. Any help is greatly appreciated. Thanks.

 

[Deuling]

You prolly have some wacky alignment issues up front if the rear is sitting super low..... Id bet castor angle is causing it.

 

[BlaZeus]

You prolly have some wacky alignment issues up front if the rear is sitting super low..... Id bet castor angle is causing it.

Yeah I took it in and they couldn't even get readings off it Cuz the tires and truck are too big.... But I looked up front and the front leaf bushings are completely toast. So that might be it. I'm swapping in a 3 link this weekend so hopefully that solves it but we'll see. Thanks!

 

[Deuling]

I'm swapping in a 3 link this weekend so hopefully that solves it but we'll see. Thanks!

Just tossing it in there eh???

 

[skunked]

Just tossing it in there eh???

On a lunch break

And what does the tire size have to do with getting a castor reading?

 

[BlaZeus]

Just tossing it in there eh???

Haha not exactly but kinda. It's coming off a 72 k10 so it shouldn't be too much work welding everything up onto my axle and frame.