My 1UZFE VVTI with aoto box is built into a Wrangler. The Wrangler's shifter and gate(?) was retained. So I have three positions for the Lexus box. I can not go from 1-2-3-4-5. Each position goes through all the gears automatically. I suspect the 3 gear positions is for Towing, Sport and Economical. Is that correct? Please advise me on this.