Front diff is a Dana 30.
everything 3.73 and up uses the same R&P.
i.e.your differential centre will fit with 3.73 4.11 4.56 4.88 gearing etc. but wont work with a 3.54 for example (not a problem as you're going higher)
Rear diff is a Dana44, but it's a special D44 made for the JK (the ring gear is a bit thicker than the D44 on the TJ I believe)
All differential centres are the same for the rear diff, just make sure it's a JK specific R&P
I was originally sent a standard D44 locker and it didn't fit properly, had to be swapped for a JK specific one.
if you want documentation, here is the Eaton locker application guide. It's what I used when having my gearing and lockers done. look at the bottom of page 11.
http://www.eaton.com/ecm/idcplg?IdcS...Name=CT_128302
FYI
I have a 2010 CRD
Mine is an Auto and I run 4.88's for 35's and i'm very happy with it
I have heard 4.56 works well for the manual though