The only Tacoma axle that doesn't have a locker are the non-TRD Tacomas which is an 8.4" diff. The TRD axle already has the electric locker in it and no other locker will fit that axle. The non-TRD axle on the other hand, you have a few options available as far as lockers go. Powertrax makes the Lockright and No-Slip, Detroit makes a limited slip and ARB makes an air locker. As of right now, there isn't any other locker options for the non-TRD axles unless you want to weld it up.
www.performanceoffroadcenter.com can get any of the lockers mentioned above for a great price
