Just installed this baby tonight. Very nice quality and it allows for pinion changes / gear mesh adjustments with out removing center diff. It also has a housing for a support bearing (included) that not only acts as a barrier from dust to your original bearings but takes some load so the front motor bearing does not wear out as fast. One screw removal of motor (2 if you choose to use but owner says one screw on slider top is fine) on slider. You must use a shorter pinion gear like Robinson's racing. $70
Plus some RC monster mounts are so tight on that diff bearing you have to pound it in and out; this one is smooth.
Company's website is: Elitercd.com