Joined: Feb 2012
Posts: 19,339
Likes: 5,451
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Assuming that your trek was an 8 speed to begin with then, YES the two shifters will serve the rest of the gear system. The actuation ratio should be the same. But the grade and the manor of the two shifters is quite different. I would think this would be a MAJOR decision factor. Andy.