Im trying to buy a lowering kit and there are two options; one that says it fits vehicles with driveshaft carrier bearings, and one that doesnt. How do I know which one I need? Its going on an 05 ext cab sierra. Any help would be appreciated.

 

crawl under your truck and see if you have a 2 part driveshaft

 

Since you have an extended cab, you should have the 2pc driveshaft and you would need the kit with the carrier bearing.

 

I thought it might have something to do with that, but I didnt know for sure. Thanks for the help guys.