Hi,
Yes, unfortunately due to difficiencies in the manufacturing process of the front gearbox top when the car was still produced by TTech, many of the gearbox tops were drilled inaccurately and therefore uneven droop occurs. If you get in touch with Xtreme RC via telephone or email, Lewis will ask for you to send in your shoddy gearbox top and replace it with an accurately drilled piece, as he now uses appropriate methods to get the gearbox top drilled perfectly.
Apologies for this issue, hope you get it resolved to your satisfaction
Tom