Hello All I have a 99 blazer with a straight axle convection
Dana 30 on Leaf springs about a 6 + lift I cant seem to correct the Death wobble at at 30 to 40mph its starts about 25 and just get worse and recomendation of what else to look at or help correct this would be great I will post pics as soon as i have taken them.

 

Death wobble usually starts with something like a tire imbalance or irregular tread wear, then quickly gets violent because of loose suspension components. Have you tried rotating the tires front to rear? Are you running a track bar (Panhard bar)? Any play in the ball joints? How much caster does it have?

I would have somebody rock the steering wheel back and forth while you lie on the ground and watch the tie rod ends, ball joints, etc. for play.

 

I will check all the above. No track bar as this is a leaf spring install.

 

Some leaf spring setups have a track bar. My Blazer doesn't, but my Ford pickup does, and I've seen some Dodge trucks that do. In most cases, I don't think it's necessary, but if you have a lot of spring arch or bad leaf spring bushings, you can have problems with the axle moving side to side.

 

*accidently posted reply in wrong thread. Sorry.