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Hello all, Well I'm glad I'm not the only person out there not really understanding this whole np203 conversion. I have recently (this week) purchased a 1979 C10 with the np203 behind a 350/350. I am guessing that the conversion kit has been put in this transfer case because: One, it does have the manual locking hubs up front and Two, I can turn the front drive shaft with the truck just sitting in 2H. I haven't tried locking the hubs and checking to see if it still turns tho. Will try this tomorrow and let ya guys know. Also I'm not real sure what the shifting procedure is for shifting this from gear to gear at the transfer case. All the others trucks I own are later model trucks with just 2H, 4H and 4L. With them i can shift from 2H to 4H while driving at a slow speed. But to go from 4H to 4L, i had to go back to neutral to make the shift. I'm not quite sure what the "rules" are on this for the np203. Any help is greatly appreciated.