There's no magic to the chain drive. A # 60 roller chain has a working strength of 2094 pounds. Your motor will not produce that much. Your motor has a 1" shaft and the winch probably a 1.25" shaft. Get two 20 tooth sprockets from McMaster. The 104-1004 motor torque on the 5" sprocket will be less than 2094 pounds.
Mount your motor with the mounting bracket I posted before like anything like this.
keeping this in mind.
If we can get a Braden adapter kit it will like like this.
But we won't know what to look for until we see your winch.
If we can't get one we might be able to alter an off the shaft motor adapter or I can suggest a very simple way to have a machine shop make one.