2/26/2023 0 Comments Transee metro 246![]() ![]() In A4WD, 95% of the power is directed to the rear wheels until the computer sees a difference in speed between the front and rear prop shafts. ![]() The other two speed sensors monitor front and rear output-shaft speeds. The PCM forwards this info to the transfer-case shift-control module through a Class 2 serial data bus. The vehicle-speed sensor informs the powertrain control module (PCM) of the vehicle’s road speed. Three speed sensors each send an AC-voltage signal. The NV246 is an “active transfer case” that is computer controlled, has an internal clutch pack and fork to apply the clutches and has 2WD, A4WD, 4WD HI, 4WD Low and neutral positions. Units with a 27-spline rear output shaft have a three-pinion low planet, and the 32-spline models use a six-pinion low planet. The three notches on the fork to locate the pads were made deeper to accommodate the Vespel pads, and the high/low-range sleeve was widened for the new pads. Previous years used nylon pads on the fork, and this was changed to Vespel pads of a two-piece design. In 2005, design changes incorporated internally included a change in the range shift fork. You will always need the correct wiring diagrams for the truck model you are working on. The accompanying diagrams and illustrations apply to a 2005 Tahoe, as several design changes were made in that model year. If the transmission is an RPO code MN8 or MT1, it will have a 32-spline output shaft. If the transmission is an RPO M30 code the unit will have a 27-spline rear output shaft. The 246 has several variations depending on the vehicle and the transmission used. Now designated the NV 246 EAU by GM, this transfer case is found in GM trucks (Tahoe, pickup, Yukon, Suburban, Suburban EXT, Escalade and Avalanche) and as such represents a large production volume.
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