question, i bought a kit xb4 4wd on 7-24-14 from amain, built the hole kit tried to put the servo in and the ears on the servo ripped off the servo. it seems like the servo mounts on the chassis is about 2mm to 1mm to wide for the servo. servo am using is xp ds1313. has anybody else experienced this problem. also i looked at the photos of the car online and it looks like i have the 2wd drive chassis is there a difference between the 4wd drive and the 2wd?