grease fitting front steering

[phonedrn8]

Are there and how many grease fitting are up front of the tahoe?
,yesterday i got a real bad shake while driving down the road streering wheel shakin very bad about 35-45mph

and what kind is used?

 

[chip]

I think they're all bushings, but I could be wrong. Do a search for "steering shaft sensor". That may be your problem, but don't hold me to that either.