[lap15]

I have a '75 K20 with a NP203. I found that since it's a full-time case you don't shift it very often and dirt/stone dust can cake on the shift linkages making it hard to shift. Take the rubber floor mat out, unscrew the shift indicator plate and rubber boot from the floor, then unbolt the trans tunnel- that will give you clear access to transfer case shifter. Spray some type of de-greaser all over the shift linkage and wipe them down. Then use PB or WD40 on the linkages, put the trans shifter in neutral with engine off and try shifting the transfer case thru the full range. Once you get it moving freely apply a water proof grease to the linkages and shift it a few more times to get everything lubed. NOTE: If you add oil to the transfer case the NP203 takes regular 10w30 or 10w40 motor oil Let us know how you make out. Lou.