I have a 76 K5 with a 12 bolt rear. I am getting ready to order a lock right for the rear. I am not to familiar with rear end work so I am going to have it installed( hopefully I can watch so I can do it next time). Anyway I was curious as to how much this job would cost assuming labor is around 50 an hour. Also will the installation of the lock right cause any problems down the line when I get the money to regear. Basically if I get the lock right put in with my 3.07s will I be able to reuse the locker with 4.10s in the future? Thanks for the help everybody! If in doubt, gun it.