Hoping someone can help me

2000 Rancher 350 ES 4x4
O.K. here's the story.I pulled the motor out so I could fix why the bike wouldn't shift gears.After pulling the motor I removed the clutch cover and looking over all of the parts that were used to make it shift.I found the culprit and replaced it with a spare that I had from a parts engine.In order to remove it I had to slide the clutch basket forward a little,removed and replaced the bad part then slid the clutch back and finished assembling the engine.Before I put it back on the frame I checked it to make sure it shifted and it did with no problems.I put the motor back on the frame and I hooked up the wiring and exhaust pretty much just the bare minimum of what it would take just to start it and test it.(None of the front wheel drive was hooked up if it matters or not and the front and rear of bike are completely off the ground).
And now finally here is my problem.When I start the bike the es shifts just fine,BUT the tires do not turn in forward or reverse.When I shift either direction I know it is going into gear cause as soon as I shift you can see the tires turn just a little,but when I give it gas they don't turn at all.I can spin the tires with my hand and they turn freely and I know when it is in gear cause I can watch the output shaft on the front wheel drive turn as I spin the back tires.Is there another internal problem with the engine or is it my clutch.The reason I believe it may be my clutch is because I messed with the adjustment on the clutch cover before removing it(thinking it was something that needed to be removed in order to remove the cover)and I'm not quite sure how to set it the way it should be set.Anybodies help would be greatly appreciated I'm just a poor white boy that can't afford a mechanic's rate so gotta do it myself.Sorry for writing a whole book here,but I just wanted to give the most info.as possible for an accurate diagnosis.Thank-You for your time.  

i am not the greatest with 4x4's but i have found over the years that when dealing with gears and clutch's it is best to know exactly what you are doing. if it is shifting gears then the clutch should be fine. what axactly makes the wheels spin on the rancher 4x4? chain driven? shaft??? im not sure. but whatever it is, the gears are not catching it, or they are and letting go because a nut is lose or something. good luck!  
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2005 honda trx450 golden west graphics, hot cam, high compression piston, hmf exhaust, nerf bars,works shocks, golden west seat cover, one industries bars, and more

It is shaft driven.I think I'm gonna have to pull it back down and take another look at it.