Worked very well for installing a rear main seal with wear sleeve on a Cummins ISL9 in a New Flyer 60ft transit bus. Tried installing a seal and sleeve with the Cummins installer, followed directions exactly, and one corner of the wear sleeve did not get pushed on. Ordered this tool and replaced it again, first try this tool worked flawless and much better than the Cummins tool. Why? Because the Cummins tool only has 2 holes in it, this one has 4 holes which provide much more even pressure against all sides of the seal and sleeve. It only come with 2 studs and nuts, I used 2 more from the Cummins tool I had. I recommend making or acquiring 2 more studs and nuts to use with this that way ALL 4 holes can be used for install. Good luck!