NP 203
 

I took my tranny out of my 76 W100 to be rebuilt and while I have my transfer case out is there something I should do to it? How do I check chain stretch? Any thing else while its out?

Here is what I have
 

Attachment 13208


1. IndexNumber Part Description

1 Adapter

2 Input Drive GearPilot Bearings

3 Range SelectorSliding Clutch

4 Range SelectorHousing

5 Low speed GearBushing

6 Lowe Speed Gear

7 Thrust Washer &Locating Pin

8 Gasket

9 Input Bearing

10 Input Bearing

11 Input BearingRetaining Ring

12 Input BearingRetaining Ring

13 Thrust Washer

14 IntermediateHousing

15 Drive ShaftSprocket

16 Gasket

17 Sliding Lock Clutch

18 DifferentialHousing

19 Rear Output FrontBearing

20 O Ring

21 Vent

22 Oil Seal

23 Oil Seal Vent

24 Oil Pump

25 Speedometer DriveGear

26 Rear Output RearBearing

27 Rear Output ShaftHousing

28 Rear Output Shaft

29 Rear Output Washer

30 Rear Output Nut

31 Rear Output RubberWasher

32 Rear Output Yoke

33 Rear Output BearingOil Seal

34 Shim Pack

35 Input Shaft O RingSeal

36 Input Shaft RollerBearings

37 DifferentialCarrier Assembly

38 Spring Cup Washer

39 Lockout ClutchSpring

40 Drive ShaftSprocket Rear Retaining Ring

41 Drive ShaftSprocket Front Retaining Ring

42 Front Output RearBearing Cover

43 Front Output RearBearing

44 Front Output DriveSprocket

45 Front Output RearBearing Cover Gasket

46 Magnet

47 Drive Chain

48 Front OutputBearing Retainer Gasket

49 Front OutputBearing Outer Retaining Ring

50 Front OutputBearing

51 Front Output ShaftSeal

52 Front OutputBearing Retainer

53 Rubber Spline Seal

54 Front Output Washer

55 Front Output Nut

56 Front Output Yoke

57 Countergear

58 Countergear Spacers& Bearings

59 Counter Gear Shaft

60 Countergear ThrustWasher

61 Adapter to SelectorHousing Gasket

62 Input BearingRetainer Gasket

63 Input Bearing OuterRing

64 Input Gear Bearing

65 Input Gear Seals

66 Input BearingRetaining Ring

67 Input Gear

68 Input Gear BearingRetainer

Some more pics
 

Attachment 13206

Attachment 13207

Your best bet is to buy a dodge service manual though as that will give you all the info that you need. I've heard that Hayes and Mitchell (sp?) are pretty good as well.

I know that most if not all NP203 t-cases are full time 4wd. There are part time kits out there that give you more options as far as 2wd and 4wd goes and can help a little with better mileage. I did this with a full time t-case in my j10 and it was something I should have done right from them beginning.

chain stretch?

I haven't been able to find anything in my stuff that says what is the limit.

Thanks for all your help, looks like a lot of work to tear into one of these.

that full time 4x4 to 4x2 par time was a great kit according to my father who i assisted on a install on his gmc p.u. it was a "warn" brand kit.
that case has a few parts in it just, the tear down and measuring of all the parts will take hours of fun and enjoyment...

With the t-case being full time 4wd, there is a differential in it. If you do go into it, I strongly suggest installing wither Warn's or Mile Marker's part time conversion kit. Or you could swap it out for a NP205 which is all gear driven but the low range is only 2:1.

Of course....... since you already have the NP203, you could make a doubler with it and a NP205. You'll need to have your driveshafts modified, and have another set of sticks in the cab...... but...... come on..... its a doubler!

never heard of that ?interesting...or as MR. SPOK says fascinating.

The NP205’s gear ratio is 1.96:1--the 203 is 2:1, a better off-road ratio, but not by much.

The 2wd kit by mile marker is a great modification, though don’t be too disappointed when you only see about one more mpg. :D

The 203 is heavy but it’s about as beefy as it gets. The most common cause of failure is INCORRECT LUBRICATION. The 203 doesn’t use ATF or gear oil. Here is an article I wrote about this awesome case:

http://voices.yahoo.com/the-process-...54.html?cat=27