Tom Sinclair added a goal at 9:47 of the second period, then Cameron Berg added a power-play tally (his 27th goal of the season) at 14:24, giving Muskegon a 3-0 lead headed into the third.
Cristian Tellier scored his 21st goal at 2:44 of the third period, then Philip Tresca and Brad Marek added goals in the final two minutes to top off the scoring.
Twelve different Lumberjacks had assists in the game.
Goalie Jan Skorpik stopped all 18 shots he faced to post Muskegon’s second shutout of the season. The Jacks had a 31-18 advantage in shots on goal.
The Jacks improved to 33-14-3 on the season, good for 69 points and second place in the USHL’s Eastern Conference. They are eight points ahead of third-place Green Bay, and can clinch at least second place in the conference by gaining one more point in the standings.
The Jacks trail Chicago (75 points) by six points in the race for the conference championship. Muskegon has four regular season games remaining, and can earn up to eight points by winning them all. The Jacks will have a Saturday night rematch in Youngstown, followed by a Thursday game in Dubuque and two showdown games next weekend in Chicago.
Chicago has three games remaining, for a possible six points.