[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

 

[Kobyashu]

Update - Last week, I finished the install.

Good news: The truck drives like a dream and the TrueTrac is great. Both rear wheels are grabbing dirt, rock and/or pavement and it is sweet! That stated, I replaced the whole differential first, based on bad advice. I only needed the gears changed, but I was tricked into buying the whole rearend. In any case,

I was fortunate, in that I got a complete rear-end of the same year, and same type with 3.91 gearing.The long story it that based on an internet sale, I got it and had it delivered for $1800.00. What I saw on-line and what I got from LKQ were two completely different things. I saw a complete rear end with what looked like refurbished exterior etc... I got a rusted nasty looking POS (picture included) dumped off in my driveway. I spent the time and completely removed the rust, re-used pieces from the original to complete the replacement. I got a good working rear-end with 102K miles. Drove it, but actually wanted the TrueTrac, after reading and researching.

Sooo... I went and got the TrueTrac on sale, and had it installed, after I removed the pumpkin and did the scut work (clean-up). Moral of the story - be SURE of what you need before you buy. be careful of internet sales... Lesson learned.