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Old 11-12-2019, 11:34 PM   #63
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Join Date: Jan 2017
Location: Le Sueur MN
Posts: 187
Re: Yet to be named... 78 K10 Suburban

Have you changed the fluid in the NP203 yet? If you remove the driveshaft you need to run it in HI/LO Lock. Since the NP203 has an open diff in it, HI/LO will send power to the shaft with the least amount of resistance. So it won't move in HI/LO without the front drive shaft. The part time kit just locks up the open diff in the transfer case and stops the front driveshaft from spinning in HI/LO. Sadly the best part time kit that replaces the diff with a new shaft vs wedges that lock it, has been discontinued.
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