ok... I stand corrected:
The LTZ is priced in two steps. The base LTZ price of $20,295 includes the appearance items. For $500 more, you get the 3800 engine, firmer suspension, and heavy-duty 4T65-E four-speed transmission, options we highly recommend.
and the 3.4 was only used from 95-97 when it was dropped cause they had too many issues. 98-99 had the 3.8L. LTZ was from 97-99. Differences were that 97-98 had 4 wheel disc while 99 had rear drums.