All new tires, balance is good, 2inch lowering shackles and no overload in rear, *4 shims, at about 55 to 60, i can look over at my passenger side seat and my console, they are both shaking like crazy, put your wrist on top of the steering wheel, and your hand will also, doesnt do it while braking, acceleration, etc., just around 60, after and before, smooth as butter, dont tell me bent axle, lol

 

Front end alignment?

 

that would be nice, gonna get it checked, thanks

 

tires out of round?

 

Sounds like your inner tie rods have takin a ****.. Its very common for these trucks. i had the same problem except mine was at around 45-48mph. You can search inner tie rods and find other situations like yours.. Cost $90 in parts and you can do it yourself.

Hope that is your fix.

 

Your welcome. I've already had the stealership replace the r&p once under warranty, and I just replaced it again about 3 months ago. It's worth having it checked before you drop a couple bones for a new or rebuilt one.

 

Have you tried taking out the shims? I've got 2 in lowering shackles on my SS and have no shims and no vibration.

 

I've got a HELL of a vibration from what I believe is my drive line. Is it one of those shakes you feel in the seat and your whole center console goes bananas? My vibe is about 50-65. Its retarded how bad it is its starting to shake the entire truck now.

 

Thats how mine was. My whole cab would shake like it was going to fall apart... i even had parke10 tell me, when he was drivin behind me and i would go about 45-48mph my bed would start shakin side to side too.. and all that was fixed after i replaced my inner tie rods, I thought it was the alignment and took it to the shop and they could tell right away it was the tie rods.

 

That's probably due to the 80e swap. Have you checked all your driveline angles?