Axle and gearing question

I have been looking for a long time to upgrade my gears, but I don't know what spline I have. I have a 2008 Ranger Sport 4x4. I know I have 3.73 gears with an open 8.8, I just don't know where to start looking for new stuff. Any ideas? 28 spline or 31 I believe are the two options or I may be way off. I'm lost when it comes to this stuff.
 
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Ok, so I've figured out that I have a 28 spline, since it's not a level II. Anyone on here have ideas on brands to look for and what type of gearing? I know I'm probably going 4.56 since I'm running 33's.
 
Yukon seems to be the favorite. I really prefer Spicer since they're O.E. and reputable. G2 is also a good alternative. Make sure your install kits have Timken or Komo bearings/races ONLY.
 
@ Brinker: where would be the best place to start looking for this stuff? I have no clue what I am even looking for.

@Hurley: I don't remember agreeing to trade grilles... I bought one a while back to change it, but I have really started to like it.
 
Drivetrainwarehouse.com is where I'll be ordering my gears and stuff from. They're having a sale right now if you buy G2 gears and install kits....I think it's get 25% off.
 
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