Which years and models have a rear locker?

not sure, but my 99 has it. Was the sole reason I was willing to pay little more than I wanted just to get it.

In 4th Gens, though not so many , the 2009 Trail Edition have Rear lockers. Also its has 16 in wheels like the FJC.

I would like to know if the 3rd Gen "Highlander" Edition have rear lockers as standard?? Because when I see one and ask, they have it.

theres two trim levels to a highlander ones got a locker the other dont

IIRC no 3rd gens came with a locker as "standard" equipment, the e-locker was a dealer option. oh and yes my highlander had it, and thats why I bought it, lol

In the '96-98 4Runners, the lockers weren't ever standard, they just came from the factory randomly on the 4x4 V6s (SR5s and Ltds). I really doubt they were ever a dealer option because it would have required a complete rear axle swap since just retro-fitting an elocker 3rd member into a non-elocked axle is a custom only job (welding and cutting is required).

Another reason I don't think a dealer would have offered this as an option is because all 4runner elocked rear axles came with 4.30 gears. If they did swap the rear with an elocked axle, they would have had to also swap the front diff to a 4.30 geared one (or regear the front) because the front would normally have 4.10s (which came on the vast majority of non-elocked runners). After all that, they would still have had to wire the elocker into the vehicle.

I can't see a dealer going to all that work when probably only 3% of the customers even know what a locker does. And, I'm sure the dealer's labor involved to do the swap would have made it very expensive (as opposed to one that came from the factory like that).

In '99 and '00, elockers were only offered on one of the 2 4x4 Highlander/Sport trim packages and still randomly (IIRC) on the 4x4 V6 SR5s and Ltds. And '01s and '02s never had elockers.

If you really want a locker "for all the right reasons" you can put in a Aussie for about $300.00.