The autos had 4.30's or 4.62's, the sticks had 5.13's.
As for the size difference between the Track/kick and the X-90, they share the same suspension, frame and drivetrain with only slight differences, none of them being size. If anything the X-90 is a little wider due to the curves of the body and the amount of overhang over the tires. The wheelbase is exactly the same between the 2 and the X-90 has more overhang at both ends meaning less approach and departure clearance.
Plus here's a little useless trivia about the X-90 that I've picked up along the way: In the US, only 7205 of them were ever brought into the country over the 3 model years that were made. You have to figure that at least a third of them are now destroyed or sitting in junkyards, which makes the remaining ones even more rare. The last year for them was 98, and only 477 were sold in this country. Mine happens to be #413, so it's actually one of the youngest ones left in the country. That's why the price of them is so much higher than the price of Track/kicks, because of how rare they are. I love mine and I hope to keep it for a very long time(Thanks, Zig!

). If you are looking for a capable rig for less $$$, then I would say look at the 2 door Track/kicks, as said above they can be had much cheaper...