My 99 Blazer, LT 4WD 4 door, leaks on the passenger side of the front differential. The axle tub has been removed and a new inner bearing installed. The CV axle and seal were also replaced. Now a few weeks later I notice it leaking again right at the seal end of the tube. I'm wondering if the store sold me a bearing for the ZR-2, high and wide front suspension or why it has failed so soon. I can't find on line the bearing inner diameter and the half shaft OD on the driven end. AZ does show the two different half shafts for the standard axle and the ZR-2 option. The tag in the glove box does not show the ZR-2 option on this Blazer. Since I've owned this Blazer, 6years, the axle seal has been replaced now 4 times. I have used seals from AutoZone, NAPA and Rockauto. The seal design is the same just a different color of paint, red or green. I don't have to worry about rust on the A-arm and bushing they are always coated with 90 weight.

 

When I want to check fitment, I'll check the part numbers for different applications to see if they are the same. GMpartsdirect.com is one of the sites I use.