I just installed a hpi two speed trans in my hpi nitro rs4 3,and my question is the car rolls fine in the foward direction,but when i push it backwards it wants to drag all 4 wheels. Is this normal,i didnt notice that issue with the single speed trans. All the gears match up fine and there isnt any kind of abnormal noises when moving the car foward.just thought maybe someone has heard of this before.