Have had a GMC K1500 4X4 for 12 years and it was great. I ordered it new with the positive traction rear end. Never had a problem anywhere including the 24 inches of snow we had in NC last year.

Now, with my new 2002 X, I am worried about traction since I don't have the Limited Slip differential. Assuming that even when I lock in 4 wheel drive, I am only really pulling with 3 wheels aren't I?

Anyone know what it takes to change over to Limited Slip? Don't want to void the warranty with mod's. Would I have to have Ford to the change over? Anyone done this and any idea on costs?