This is not true 2wd runner were optioned with a locker just like a 4wd, 99 was the last year for the option at all in the runner.
Well, I've never seen or heard of a 2wd 3rd gen 4Runner factory equipped with an E-locker.
Furthermore, according to every year of 3rd gen 4Runner brochure, the E-locker was not available on 2wd models.
Finally, the E-locker was a factory option on 4wd 4Runners, through the 2000 model year.