finally found out why my silverado shakes at @ 60 to 70 mph. it wound up being a alignment problem. talked to the guy that does the alignment where i usually take my vehicles to . told him what it did ,he said it sounded like a caster problem. did the alignment ,now it rides almost like a new truck. thank you all for your input,very helpful.

 

Good deal!!

 

That'll do it. Glad you found the problem!