i used that part instead of the oring. I think the oring was supposed to help keep dirt out? Anyway i never liked the resistance it put on the diff action so i removed the oring and used this new dirt sheild..
I wish schumacher would redesign there diff. I hate the cone washer and locking grub screw. I want an externally adjustable diff that uses a diff spring. Similar to losi. You do not need to remove wheels or camberlinks to adjust. I would also like to see a gear diff(mainly because i am very lazy now and my durango has one and its tuff as nails)
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