You don't have to remove the rear wheel to replace the inner primary. The belt is attached to the trans. sproket, which is not a part of th inner primary. Rule of thumb on seals, every time you can replace a seal, do so. In your case it would be the shifter shaft seal, inner primary seal and jack shaft seal. Also, be sure you use silicone on the back side of the primary where the bolts attach to the engine case. Or else you will have weepage along the threads of the bolts. You do need to get a service manual, there are torque specifics you need to adhere to. ( don't forget the clutch hub nut is left hand threads, many a mechanic has runined a knuckle or worse because they didn't know this). Guess what ? in 2007 and later the nut is right hand threads. See why you need a manual.