my speedometer is broken, what it dose is when im driving it jumps all over the place. any one have the same problem? any ideas?

 

I'd say a new gauge cluster.

 

yea that or you could try the rearwheel speed sensor as it is what the speedo uses to calculate speed,

 

Sounds like a speed sensor to me.

 

any one know how to change the speedo sensor

 

yea its on top of the rear differential and it just pulls out, easier to do on a lift, and be careful not to break it off in there and lose it there is another post in here w/ better directions if you can find it try a search