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Re: Oh Boy!!!!
The NV233 selectable transfer case is used on your '98 Blazer. Both drive shafts are "live" at all times. They both turn simultaneously when the vehicle is in motion. The front differential is locked to power when the actuator is activated by changing the mode switch to 4HI. 4LO is accomplished when the encoder motor changes the gear range in the transfer case.
Put the mode switch in 2HI. Put the transmission in park. Raise both front wheels off of the ground. Leave the rear wheels on the ground. If you can turn your front drive shaft, (by hand) there is a problem in the transfer case.
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