So i have an NP 203 transfer case in my 78 bronco and i was wondering if someone could teach me a few things. So first off this is the shift pattern i have on my ****, i have seen a few pictures and read a few threads that showed my pattern isn't off of something else.

As for what i wanted to know is since i had my tranny rebuilt i was installing the 203 today and once i got it up and was doing the linkages for it when i had it pulled all the way back, hi lock, the front output yoke would still spin free on it's own. Then all the way up, low lock, it didn't. I don't think this is normal but i don't know much about this stuff so i was wondering if anyone had an idea.

Also i was wondering about the whole hi then lock lo then lock thing, why do they have it that way? I haven't noticed any notches besides N then full forward and full back.

Thanks guys.

TGM

 

Thought some of the experts would have replied, guess not.
The lock positions are to lock the center differential for soft going, should not be used on hard pavement.
If the trans is in Park and the center diff locked neither the front nor the rear outputs should rotate.

 

Ah thanks for responding. i think my shifter was in reverse or something so i wasnt sure. So if i am going to put it in 4 low and i stop before it clicks is it not locked in? I have felt the affects of dry pavement with 4wd from when we had snow here and it is pretty crazy, i am definitely able to tell if 4wd. I haven't tried this in 4 high. Now if you could answer this also, i noticed on a few other threads pulled from google that the shift pattern is opposite of what i have. So is full forward low and full back high? The PO of my truck didn't tell me anything about the 4wd system (i am new to buying a 4wd) i didn't ask anything but if it worked.

 

Most transfer cases are part-time. This means that you have only one axle driving (2HI) when on hard surfaces. When shifted to 4HI or 4LO the front and rear axles are mechanically locked together to give four wheel drive. If on a hard surface when in 4HI or 4LO and making a turn the front and rear axles start to rotate a different speeds and so you get driveline wind-up. This can put a big strain on all driveline parts and so only 2HI should be used where one axle is free wheeling.
Now you have something different. You have a full-time transfer case where the truck is in four wheel drive at all times. To allow for driving on hard surfaces a center differential is fitted so that front and rear axles can rotate at different speeds so no strain on the driveline. This can be a disadvantage in very slippery conditions as engine power tends to be directed to the axle that is slipping the most. To overcome this they give you the option of locking the center diff, hence the Lock position on the shifter. In practice you would probably rarely need the Lock position.
If the shifter is working properly you should feel a positive detent at the HI and Low positions of the shifter before you get to the Lock position.
Hi is usually shifter pulled towards the rear, Lo pushed forwards. Easy to tell as when in Lo the forward speed of the truck at full engine revs will only be about half of the speed in Hi.
To shift from Hi to Lo the truck should be stationary with trans in neutral.
Hope all that is somewhere near right and understandable. I only ever had one truck with full-time four wheel drive and that was a Jeep Wagoneer with Jeep`s Qudratrac system.

 

Thanks a lot Lazy K, i had heard that i had a full time but i didn't really grasp what it ment, i figured it was like AWD for a subi or GM or something. I don't have experience with it yet so i don't know if there is a dent in hi and lo but one of these weekends i can get out and play with it. I have a gravel portion in my drive way so i don't bind anything up. Now we had a bit of snow here in washington this winter and i decided to use 4wd to go get lunch, i am pretty sure it was full forward and i had a hell of a time driving, i was diagonal the whole way (about 3miles) to the pizza shop. Like the front wheels were pulling me faster than the rear wheels. I don't know if this is normal.

Thanks again guys, learning this stuff will help me come june-august when i do a bit of trail riding.