Please be careful not to touch the seals when installing your CV shafts! The splines are sharp and can easily cut the seal. We had a unit come back that was leaking at the CV seal. The customer swore up and down that he did NOT stab the seal during install and he demanded we pay for his labor and shipping to get the unit back to us to fix the leak. The picture below is of the seal we pulled. You can clearly see (with our awesome camera) in the picture below that he hit the seal with the shaft by the clear cuts which match the CV splines perfectly. Keep in mind that we replace the seals when we rebuild your unit. If that brand new seal is leaking, you most likely stabbed and cut it with the shaft.