Don't Forget the Splines
Because the rear ends in dirt cars often see extreme articulation, many racers use Bert's ball-spline tailhousing. This innovation allows the tailhousing shaft to extend several inches without allowing dirt and sand to invade the housing when the shaft slides back into place. Cook recommends disassembling and cleaning the ball-spline shaft and housing after every two to four races.
This is NOT in February, 2009 issue of Circle Track