The lube locker gasket is the only way to go as far as I'm concerned. No spreading or scraping RTV. No mess to deal with...just line it up and go. It seals well and you just use it again when you change diff fluid. If you're installing a locker or gears, you're going to go through a tube of RTV upon install, and another tube when you do your first lube change. By the time you buy a couple tubes of RTV the cost is the same as a lube locker. Save yourself the fuss.
Two thumbs way up on this product!