[Benjamin_dclxvi]

I don't have the TRD, not sure the 00' had that option. Anyway I would like to have locking differential front and rear. What are my options?
I just did a 2.5" lift and put 33x12.5r17 and 17"x10" -20 offset... Loving how it looks with a lift and bigger tires..

 

[Kobyashu]

I have the 2000 AC 4x4 and just finally trashed my rear-end. Went with the "Torsen" style rear-end as it gives the best of the Limited Slip Differential (LSD) advantages, without wearing out in 40K miles. It requires no additional "Lubricant additives" and IMHO it is a major improvement on the "Air-Locker/E-Lockers". Currently, our year vehicles use this model. There seems to be a lot of misinformation of the size of the rear diff, for the 2000-2002 TUNDRA. The 4Runner, Tacoma & Tundra shared this diff size for a few years. In any case, after about five months of research, this is what I used for the rear. Check it out on 4WD Parts... As for the front, we have IFS, so no real locking diff option.
Eaton Detroit TrueTrac Toyota Tacoma 8 Inch Rear Differential - 913A541