IMO...
The TrueTrac works pretty good in the front of my XJ, there are times when it works really good and then there's times when it's OK. But I have to say I'm still running stock 27 spline shafts and it has pulled me up pretty rocky climbs without breaking anything, so that's a plus. As with all LS, if you pulse the brakes when one tire gets light you can transfer some of the torque over to the tire with the most traction.
As for the back, Auburn
HP Limited Slip http://www.auburngear.com/aftermarket/product_listing.aspx?category=4ea7b7ea-ad65-492a-830f-1b8a333d16ef is the way to go! I have this in my stock 8.25 and it's
AWESOME 
and Hoak's put these in for me. I would love to have this in the front, I believe that combo would be as close as you could get to being Locked without worrying about breaking shafts, but they don't make this for the Dana 30. The only downside, which doesn't bother me, is you have to run Fiction Modifier, just like all the other clutch or cone LS.
As with all LS they are... well,
Limited in their traction (which is good if you're running stock shafts). The HP unit I run in the rear does seem to get tighter as more and more Torque is applied
. As you can tell, I can't say enough good things about the Auburn HP Limited Slip.
WARNING: as with any traction device you run in the rear, on wet roads if you jump on it and cause both tires to spin you WILL fish tail
That's something to think about if you're on a curve or slopped road.
Tattoo
