There is different tension clutch springs ,you can try to replace the clutch spring with a more stiffer spring ,as it
is possible that the spring or springs that you have has lost its tension!
Why does the buggy rock backwards? An also ,it looks like the buggy is new an never ran ,so was the buggy a kit an built
by someone ,or was it a RTR version?
I would make sure that the center diff has all of the parts inside ,an make sure that the front diffs are built right an the diffs
not...
Make sure that the gear mesh is right with the clutch bell an center diff spur gear ,an also ,make sure that you
have installed the wheel pins!...:cool: