Need help! How do I find out what size my center support bearing is? I'm seeing options for 35mm bore as well as 40mm along with sizes listed in decimal form, I'm gonna spare myself the embarrassment of trying to convert those so here I am!

 

You will need to crawl under your truck and measure what came from the factory. Stop at Harbor Freight and pick up one of their digital calipers in order to measure the outside diameter of the driveshaft where it enters the carrier bearing. That will be the bore size of the center support's carrier bearing.

Good Luck!