No need to reset up the gears in a Toyota when installing a Lock Right. Follow the instructions that come with it and you'll end up putting the set up back where it was.
One thing if you haven't already purchased the lockrite Aussy makes a real nice locker very similar to the lockrite but in most applications it is about 20-30% cheaper.
Did some looking and found that the Sparton is made by Yukon not a lot of information out there but it looks like the people who have used it are happy with it. Did the research becasue I am always intereted in the next best think that can save me a buck or two and I need lockers for my latest project.
Here is a JP magazine that talks about the Sparton locker!