I have an Eaton true track in my 97, with 373s. Thing is, I'm running 275/60/15 tires. The 373s on that OE, or close to the same high as OE tires are grate. You could always sale you 373s. As for the posi, you should be able to just swap the gear set. If you don't know how to do the rear end work, do what I did, teach yourself. Of course keep in mind that your front dif gears, and your rear diff gears, need to match.I did just spend a good chunk of money on the posi 3.73 gears so :/ idk if I can swing it