how old is your car? in my case i i had the leak from the time i got the car. butch did what was necessary to replace/fix the seal, i had to send him the stub shaft. now that winter is coming you'll have alot of time to fix the problem before spring. I agree that the repairs would be easier with the center section out of the car but I am not sure of the trade off between removing the diff and the time it takes to remove the caliper, also I installed my parking brake after the body was on, once again not as easy but it is just time and patience.