BRAND NEW Rear case 1/2 for the NV-246 Auto T-case used in Chevrolet full size pick-ups and full size SUV's from 1998 to present. This transfer case has a built in design flaw which causes a very small oil leak in the rear case, that requires replacement of the rear case, if caught before total t-case destruction occurs from lack of lubricant. If you have the good fortune of having seen the leak and are now tending to it before internal damage occured, then this is your GENUINE New Venture replacement. We also offer a update pump fix that eliminates this leak causing problem in the future,WE STRONGLY RECOMMEND THIS BE INSTALLED WITH A NEW REAR CASE, check it out under "Problem Fixers" category in the General Motors T-Case section.Questions? Call us TOLL FREE 1-877-614-4327