I have a Chevy Suburban 3/4 ton with the 6.0L engine 4WD.Question:  Hi, there are three different types of transfer cases, 27 spline MWTCGM034, 29 spline MWTCG043 and 32 spline MWTCGM044.Which type is the best/right one for my Suburban.Answer:  To replace your Transfer Case Model  NP246 Assy # 1577-2806 the correct part number for your application and assembly number is MWTTCGM044 your cost is $1000 exchange with a $250 core deposit.This transfer case has a 12 month warranty. Shipping charges will be added. You can save the core deposit if you would like to send your existing transfer case to the factory. The case must be in good shape.If you need more technical information, help or to place order call 888-824-2012 ask for Chris, Adam or Scott they can help you.  You can see the other parts that we can provide for the NP246 Transfer Case on site.