I have a warn 9.5 Ti on my wrangler. I love it, I'm glad I bought it, I think it is perfect for a wrangler. It has enough pull for a real good mud stuck and it is big enough to pull most everybody else out.
My trailer weighs 1925 empty, It is 6'10x18'. My jeep weighs 4480. The axles can handle 3500 lbs. a piece. I use to tow It with my 1500 Z71. Now I use my R 1500 suburban with a weight distribution hitch, both towed It no problem.
I read some where that it was the spiraling in the bore of the spacer that made the whistling but the smooth bore did not. I am only quoting what I read.