OK, i have gear diffs, but i figured it out. The wheel wont spin the opposite way if the drive part of the differential isnt being held. I took apart the whole back end of my car to figure out there was just a stupid second grub screw that was loose. Jeeze, i learned quite a bit from that though, took apart diff and checked it out, kinda fun so back end problem solved, but the reason the front end doesnt work is because when it got ran over by a motorcycle the other day [X(] i lost one of the axles that connect the diff to the wheel (btw whats that axle called?) the getting run over part was kinda wierd (was distracted by some kid, asked if i build it i said nah, bought it off ebay, then i look and my car is heading straight toward a motorcycle, coulda been a horrible head on collision, but i swerved, spun out, didnt notice it was facing the side of the motorcycle, gassed it in shock, and it went right under the back tire of the motorcycle, eek), and embarrasing lol. but luckily it was only the very front end of the car where that bumper is, of course i had the body on that time i was driving it, and the front end got crushed, so its hard to put on now... but i will prob go to the hobby store to get that axle and i should be good to go

thx for your help kwong

that is all the body damage, nothin much, but i am very lucky