Haven't tried this one before. I've got a 489 pig, 3:23 open diff, I'm going with a clutch suregrip, solid spacer and 3:55 gears. Ebag has a "master rebuild kit" that I think is required. Some of the suregrips listed are around $400, others are described as "heavy duty" with a Yukon part number for about $170 more. Are the cheaper ones Chinese units now? How difficult is this? I'm fairly handy, built a good running 340 and rebuilt the 727, but this is the first diff Does my plan sound ok? Anything else that I might need? If you've done this before, any help much appreciated.