I set the backlash on my 4.30's to tight. .0035 to be exact. I had a source telling me proper backlask was .004-.008. As it turns out Ford Spec is .008-.015. What should I do? re do them? They are quiet and everything seems to run great, aside from a vibration occuring at high speed I am beginning to attribute to the driveline. Anyway what is the problem with them being this tight? I run fully synthetic oil in the back (mobil gear oil) so are they getting properly lubed with this tight of a set up?