The 2.6, 2.8, 2.9, 4.0 flywheels all bolt in place of each other, although the 4.0 requires a different clutch and starter. The 2.8 flywheel will and does work very well in a 2.9. There are 2 different 2.8 flywheels, one retains the pilot bearing, the other puts it in the crankshaft. It depends...