rear differential problem ! need help :P

[mickdeb]

recently ive bought a 1992 toyota 4runner and i need to change my rear differential but i dont know the price of this piece so can somebody say me how much it could cost ? this summer ill buy a 1996 4runner but for now i need to keep my 1992 to practice and make some fun thanks

 

[fourwd1]

You need to change your diff? why?