Best 14 Bolt Posi?

[gmech]

I am putting a posi unit into my 14 bolt rearend, I would like to know which type would be best for my application. The truck is 2wd and I am not quite sure what style I should go with. I am probably going to go with a 4:10 gear ratio. Unfortuanatly someone took all the guts out of this rearend before I got it so I will have to replace everything. I have thought about just buying a used one, but then you dont know what you are getting. Thanks Chuck