What's involved in getting the LSD off a 3.70 diff and on to a 3.90?

http://www.indysworld.com/80s/general/USRM/mick-usrm/lsd-swap/lsdswap.html

hi,

 my only comment is that it's better to use all the 3.9 diff gears and case, put the 3.9 ring gear on the posi carrier in the same case the 3.9  came in.  this is because the pinion depth is already set for that gear set and diff case, and the only setting you would need to do is the backlash, just adjust till clearance is right.  switching the gears into the other case  you would need to reset the pinion depth, if not done correctly will be trouble for sure.

Thanks all for the tips, I've bookmarked that video..