National 710496 Trans Case Output Shaft Seal

Fit my 2005 GMC Sierra 1500 with the auto 4WD crew cab short bed.

Excellent quality seal. Just like OEM. Took me about 15 minutes to change it. Just had to set the e-brake, put the vehicle in neutral to make sure there was no load on the driveshaft, remove the driveshaft by removing the 4 bolts from the u-joint straps and slide the driveshaft out of the transfer case, and then, using a large flat-blade screwdriver and a hammer, knock out the old seal by tapping on the flange in alternating spots to work it out of the housing. I expected to get some fluid out when the driveshaft was removed and the seal was pried out, but I got almost none. I know the transfer case is full because I just changed the fluid and I can touch it through the fill hole, so I guess it naturally sits below the level of the drive shaft, which is nice. The seal has a rubberized coating on the outer mating surface, so no sealant is required during installation. I just coated everything with AutoTrak fluid and carefully tapped the new seal into place. You can use a seal driver, but I had no problems just alternating back and forth with a large punch and hammer to gently tap it until it was fully seated all the way around. Then, you just slide the driveshaft carefully into the transfer case, rotate it to line up the u-joint, and then bolt it back on. Should literally take no more than 30 minutes for someone with even a basic amount of mechanical skill.

I installed this on the output shaft of my transfer case on my 2000 Chevrolet Silverado and it stopped the fluid from leaking out of it. Easy to remove and install in a few minutes after removing the drive shaft.

Doesnt fit my vehicle

Easy to install. Worked perfectly on my 2002 Tahoe.