I would have thought it is the shimming of the bevel and diffs in the gear box.
First I would recommend shimming the bevel gear and put in the lower case,shim until it starts to get bind then take one shim out,then put the diff in the lower housing (without the bevel gear in) and shim until it binds and go back one shim then you know how many shims are needed. Then put the bevel and diff gear back in and move the shims about on the diff until it spins freely(not too freely though).
Another thing I would recommend to make the car run smoother/quieter is to put diff oil on the bevel and diff drive.
Hope this helps. With all the power drive you get with the 410,the gearbox must be shimmed correctly,I know because mine made the same noise when I first built mine!
|