lockers for my 2011 tacoma and cracked Diff

whats up guys. i have a 2011 trd sport 4x2, ive been hearing lockers help a lot off road. but i wasnt sure if it applys only to the 4x4, and where can i get rear lockers for a descent price.

Also , i got in a accident last week, and my diff cracked so its getting replaced anyone have any suggestions on a diff to get ? or should i get the factory one ?

 

first welcome to tw, and yes, lockers help a lot, 2wd it will make a big difference but 4x2 is still 4x2.