Brute 750 Lighting

Good morning, I am new to the forum. I'm 75 years old and love getting ATVs back to usable condition. I particularly like the 2006-2009 Arctic Cat 250 Utility. I currently own 6. The 2006 I am working on only has reverse and low gear. The "drive shaft" in the transmission is completely stripped where the high gear would mesh. Has anyone on here replaced the shaft. I'm told I have to split the case. I was hoping that someone on here could let me know how hard it will be. I already have it stripped down to where the shaft coming in from the clutch side is the only thing left. I was hoping I could just remove the driven clutch and drive it out from there. Directions say different. Any help would be greatly appreciated.

Just some friendly advice on new tires. Check with your ATV dealer. 
There are so many aftermarket sites, Revco, Royal Distributing, Partzilla, and on and on. Even with their “ big sales”, my local Canam dealer’s REGULAR price beat the tire prices of the 3rd party sellers! People often assume the Dealership will cost them more, but I found this not to be true!

Hi All.  I introduced myself some weeks ago with my 2006 LT-F400F that needed a list of repairs including replacing the cracked generator cover.  It is back together as of last night and cranks up, idles and revs high pretty well.  Needs some fine tuning and stop backfiring at stop.
The big issue is it will not go into gear.  I reassembled the insides with help from y’all’s posts.  The transfer selector moves from H-L-R, and the foot shifter moves thru the gears and finds neutral easily enough.  Before I tear it back open, the  transfer selector on top does not move as far as the repair manual says.  The diagram shows the shaft moving something like 40 degrees between L and H and 50+ degrees between L and R but it doesn’t move that far even though it finds the indent areas and moves well.  
Could this be the problem.  I aligned all the dots on the shifter gears inside and it appeared to not be binding anywhere.  I do hear the gears touching when I shift like they are trying to engage, but zero movement from the ARV
It was somewhat difficult to tell whether all the parts are installed on each shaft.
Are there better/bigger photos somewhere that would allow me to be confident I included all the washers and bushings, etc?  If I had any doubt on parts that were laying inside after the cover broke then I purchased replacements from online stores.
TIA for any input or feedback!!  Pics are from when I first took the generator cover off.

The stock driver seat cushion is separated at a seam. I took the seat apart and found that the material has torn and cannot be re-stiched. I'm trying to find a replacement seat. Any suggestions? Hoping for a used seat but couldn't find one on Ebay.

Hello All !
I am looking for a service manual and wiring diagram for a 2005 50cc Polaris Predator 4 wheeler.
Could anyone help with this?