Passenler led the Bulldogs with 207 yards rushing on 12 carries for a 16.9 yard per carry average. Johnson added 65 yards on 12 carries for a 5.4 yard per carry average.
For the Tigers, Jorge Cavazos scored on a one-yard run and a two-yard run.
Ravenna is now 2-2 on the overall and 2-1 in the conference. Shelby fell to 0-4 and 0-3.