Mechanical positive-locking differentials have been the staple for drag racing, circle track racing, off-road use and a variety of other performance applications for decades. The Grizzly Locker features a forged case, 8620 internals and a patent pending design which reduces common locker failures. These units provide maximum traction and strength for many performance applications.
We are a Yukon Gear authorized distributor and installer. Below is a link to their site. Check it out, find what you need, and give us a call. If you're not sure what you need, give us a call and we'll provide recommendations and experience.
http://www.yukongear.com/Positractions.aspx
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