Well I have factory 3.23 posi in my 97 LX. I know you can add almosty any gears but too much and you will need a computer chip to make the corrections properly. Id like to swap to 3.73 gear set or 4.11s. I am sure 4.11s I would have to get a computer and to buy the gears for 100+ dollars and a 300$ chip at the same time I don;t think I want to do. I read somewhere i thought that 3.73 gear upgrade only requires a differnet speedo gear? Or am I wrong? i plan on racing my car and just getting more performance out of it. Gears are cheap but the other expenses might add up fast. Any words of advice? 4.11s? 3.73? 3.90s? neither?