Are ya sure its not a u-joint/backlash issue? just for fun put it in 4X4 and slip it in an out of gear.... mine bangs as well but in 4x4 it slides in nice, mine has play in the rear slip joint hence the "bang"
when in 4x4 it helps to take the slop out of the driveline, unless the front shaft/u-joints is shot, also if the rear brakes are out of adjustment it too can account for driveline bang