REAR DIFF??

Just a question for you folks. I have heard of some company that sells the entire rear differential with the gears of your choice. I know I can call Jasper and get another differential but is there another company that offers a performance set up?? I need to replace both rear axles due to some pitting, so I see this as the chance to get some 3.73's in the back??
Help if ya can

Thanks.
 
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