IDGAF

Everything is functioning and no odd or bad sounds tried every gear including reverse it just won't go. Do u know if the trx300ex parts are interchangeable with the trx400ex they are both 2005(and just wanted to correct the post is about a trx400ex that won't go )but I have a 300ex that's dead and hopefully for parts if the are interchangeable

I have a 2005 Honda TRX 400EX that will not move starts fine runs fine but when I try to go it just revs and forward and reverse will not move at all could it be the clutch? Or something bigger than that?