is this a np203 and what are these locking hubs

[w200/m880]

as my trucks an unknown quantity im not sure if this is a np 203 fitted and these locking hubs which i will get rid of as soon as i can hoping they havt damage the transfer case.

 

[Bob H]

The 203's case is mostly cast iron. Should be a tag on it somewhere.

 

[K10A]

Thats a 203 get rid of it is what I would do.

 

[Bob H]

Milemarker made a conversion kit for 203's.
yours may have been modified?????????????
I have not had any issues with any of my 203's

 

[Elwenil]

Nothing wrong with a NP203 if you like full time 4WD. Of course that looks to have had a Milemarker part time conversion done on it so it's now part time 4WD. The NP203 is almost as strong as a NP205 and will give long service as long as someone doesn't put something other than the SAE 30 motor oil in it that is supposed to be in it. Many people mistake them for NP205s and put gear oil in them.

 

[w200/m880]

thanks for the answers,book recommends sae 10/30 for trans case,do you concur ?

what makes you think its been converted?

one of the turning bits for locking hubs is trying to fall out which is main reason for enquiry,should i repair or replace it with standard full time hubs and will they still work with milemarker conversion if fitted.

 

[Elwenil]

The M880 and all '75-'79 Dodge trucks are fulltime 4WD and have no locking hubs on the front axle, just a nut retaining the stub shaft. The fact that yours has Milemarker Selectro hubs on it would lead me to believe that is has had a Milemarker part time conversion done on it. It's highly unlikely that someone would do the conversion on the axle without converting the transfer case also as unlocking the front axle or similarly disabling it (like removing the front driveshaft) will damage the transfer case as it will no longer move in the normal high and low shifter positions but has to be placed in the Loc positions which wears the differential lock pins in the NP203 transfer case. As far as I am aware, all the parts used in the part time conversion, including the hubs and other internal hub parts, are unique to the conversion kit.

 

[w200/m880]

thanks for that,in your opinion if i junked selecto hubs and went back to full time would trans box still work as factory.

 

[Elwenil]

Most likely not as I would say it probably has the part time conversion done on it also. It was usually sold as a complete kit to add locking hubs to the front axle and convert the transfer case to part time 4WD.

 

[K10A]

This should explain a few things.

Mile Marker NP203 part time kit