Ok here is an installation of a Durablue +4 extended rear axle. I had a few friends who were useless with the instructions so I figured to post the installation step by step:
1) Get a monkey wrench and loosen the large nuts holding the axle in place. 2002 and up will require an allen key to remove the two small screws in the nut. Then, once you have loosened the nuts, jack up the bike so that the rear wheels are off the ground. Then, remove the rear tires so that you have access to the axle.
2)Then completely remove the nuts as in Figure A. After doing so, you will want to remove the right nut holding the hub in place as shown in Figure B. Once you have done that, the hub should slide right off. If not, gently knock it with a hammer evenly on all sides to loosen it:
3)Check out the difference of the two axles:
4)Remove the posi lock from the Extended axle. It should slide right off, if not evenly on all sides, tap it until it falls loose:
5)Slide the axle through the sproket hub. Before doing so, you might want to check your seals in your axle carrier to make sure they are intact:
6)Make sure you slide it all the way through so that the clamp touches the sproket hub as shown below:
7)This is how it looks from the other end:
Then slide on the posi lock as shown in figure D and then clasp the ring into place right under the posi lock. If you look closely, you will see the grove where it should go. Then tighten the allen key but make sure you dont tighten it too much. Then, make sure you add on all the spacers (figure E) that they give you to be able to get the +4:
9)Replace the hubs as you have removed them from the stock axle. Put back on your tires and your off:
BY the way, its easier when you have two people while doing all this so when you are loosening the nuts that hold the axle into place, the one guy can sit on the bike holding down the brakes.
Have fun and good luck.