Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

203 to 205

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79blzrfan, Jan 27, 2005.

  1. 79blzrfan

    79blzrfan Registered Member

    Joined:
    Mar 9, 2004
    Posts:
    21
    Likes Received:
    0
    Location:
    Michigan
    I have the 203 fulltime case in my 79 K5 how much work is it to go to the 205? Will I need new driveshafts and a will it mount to the turbo 350 trans with out an adapter?

    Scott
     
  2. ironnut

    ironnut Registered Member

    Joined:
    Jul 14, 2004
    Posts:
    77
    Likes Received:
    0
    Location:
    Missoula, MT/Redmond, WA
    I did the swap on my 76'. You need to have the th350-np205 adapter, because the adapter currently on your rig is for a th350-np203. The shifter linkage is also different. It's a realtively easy swap, took me and a buddy a long afternoon. Try to get a tranny jack or something similar to make your life a whole lot easier. I rented one from a rental store. You will need to have your driveshafts modified.
     
  3. OrangeCrushK10

    OrangeCrushK10 1/2 ton status

    Joined:
    Jan 25, 2003
    Posts:
    1,425
    Likes Received:
    0
    Location:
    Square State + Suspension Item
    I did this exact swap on my wife's '79 K5.

    You will need:

    *NP205 Transfer Case
    *NP205/TH350 adapter
    *The coupler sleeve thing that connects the output shaft of the TH350 to the input shaft of the NP205 (I forgot this part and had to run back to the junkyard to get it!)
    *Extend the rear driveshaft 5 1/2" (I think, better measure to make sure)
    *Buy and install a SYE kit for the NP205 (what I did) OR buy a slip yoke for your driveshaft.

    I think that was about it.
     
  4. Resurrection_Joe

    Resurrection_Joe 1 ton status

    Joined:
    Jan 9, 2002
    Posts:
    17,372
    Likes Received:
    0
    Location:
    Gettysburg, SD
    From what I can remember, only 1980 NP205's are slip yoke
     
  5. Resurrection_Joe

    Resurrection_Joe 1 ton status

    Joined:
    Jan 9, 2002
    Posts:
    17,372
    Likes Received:
    0
    Location:
    Gettysburg, SD
    Also, figure out how much work and money it is it is to switch, THEN figure out how much work and money it is it is to make a doubler
     
  6. NorthWestFab

    NorthWestFab 1/2 ton status

    Joined:
    Jan 11, 2005
    Posts:
    311
    Likes Received:
    0
    Location:
    Canada Eh.
    1980 and newer NP205's are all slipyoke, excluding those from crewcab trucks, which were fixed.
    1980 was the last year for the NP205 in all trucks except the K30's.
     
  7. Resurrection_Joe

    Resurrection_Joe 1 ton status

    Joined:
    Jan 9, 2002
    Posts:
    17,372
    Likes Received:
    0
    Location:
    Gettysburg, SD
    Shawn Spickler has betayed me!

    From his driveshaft article -

     
  8. 79blzrfan

    79blzrfan Registered Member

    Joined:
    Mar 9, 2004
    Posts:
    21
    Likes Received:
    0
    Location:
    Michigan
    Thanks for the help. I'll look at all the costs and make my decision before I spend the money on the part time kit for the 203.Scott
     

Share This Page