Hey bcane, you know everytime I see something about a mantis i'm always intregued because my friend bought one. It's amazing that almost everyone has the steering servo issue where the servo saver is too tight and ruins servo's. And now, the rear diff. I just replaced the rear gears with savage gears and has been working well for him. I'm wondering if robitronics has word of these common problems. I heard that HPI has there hands in robitronics. Sort of subsidiary of HPI if you will. Anyway, just thought i'd let you know you're not the only one out there.