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I've purchased some used 4.10 gears for my tj. They are factory installed in a 4 cyl I guess. My question is is there a way to know what the markings on the pinion gear means. I assume shims used or something related to pinion Depth? Any help would be appreciated

I believe the benefits are obvious to why we need adjustable control arms... That being said I'm wondering if I'd be better off making my own with a off-road supplier parts and crome molly tubing or buying something. I really like the double adjustable aluminum from metal cloak. What are...

Is anyone using one of these? http://www.northwestfab.com/NWF-BlackBox-Underdrive_c_7.html Thoughts, experience? I've got a 1999 tj with 3 speed auto. I like this idea due to it's short design.