how do i change the front sprocket on my 2000 trail blazer. another thing is there a good after market sprocket i can buy my stock sprocket wore out in less than a year.

 

I also need a new chain and sprockets, I was thinking of getting a D.I.D chain and those laser cut sidwinders sprockets

 

Here is a few good after market ones d.i.d. and sidewinder

 

Blazer,
Just pull the side-plastic... Loosen the chain, remove the bolt and slide the sprocket off...
I don't remember if the Blazers have an outer support bearing that supports the output shaft or not.. If it does, you will have to remove that bearing first...