Guys I have have the exact same problem. Same thing exactly mentioned. Really noticable in 3rd-4th. I don't think its in the brakes. But yeah it is 100% the same as mentioned in the first post.

 

I have 2 2007 Ranchers.
One makes that sound, the other doesn't.

Anyone find the cause?

Thanks

 

Bought 2 2013 Ranchers from the dealer, mid-June. (non-AT/ESP, non-PS)
One of them made the squeak/squeal/wheeze noise immediately, the other started after a couple weeks.
Dealer techs say it's a dry seal on the diff for the drive shaft and that i should 'just keep it lubed'.
Seems to me that's something i shouldn't really have to do on brand-new machines, but it does stop the noise for a couple hours when i do.
I'm going up through 60-70 hours now, just did the recommended 1st oil change and the problem persists.

I took the 2nd machine back for another unrelated noise - a sort of uneven tick in the motor that seems to become more pronounced after running for a while.

They didn't think either of the issues were a problem, but did recommend that I bring it back for a closer look later in the season, when their service schedule slows down.