Thats an L series as you've been told already. The L series is basically the same as the G series as far as over all strength goes. As the years progressed the trannies got stronger ans beings thats fromt he first gen well ya get my drift....
Its not the strongest trans but if your not banging gears every shift it'll hold up to a lot of abuse. Just be carefull to not beat on reverse, it'll break...