Yeah, the center oneway is the easy part to lock up or mock up. Just the front diff was giving everyone the head ache. I'll try it later on down the line when I need it. Right now the oneway is all I need for outdoors.
I too agree with the .04 and 64 pitch gears. Mix the two and they are noisy. That's how it was when I first ran the 415. Til I switched over to my RW spurs.
53440 is the Spring Kit. You'll need 2 of them. The pack comes with 4 pairs of springs. 2 Kits will allow you to have the same spring color at all 4 corners if the setup calls for it.