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.

Fitting a 3/4 ton drive line to a NP203 t-case

Discussion in 'The Garage' started by odoa3, Apr 11, 2005.

  1. odoa3

    odoa3 1/2 ton status

    Joined:
    Mar 31, 2004
    Posts:
    1,638
    Likes Received:
    0
    Location:
    Anchorage, AK
    I am getting ready to swap a 14 bolt into my 75 K5. The 14 bolt came out of a 3/4 ton late 70's or early 80's truck with a NP208. I have a 203 t-case in the K5.

    Couple questions.....

    #1 Will I able to fit the 3/4 ton driveline to the 203 or will I have to change the yoke on the driveline or t-case?

    #2 Can you take the yoke off the 203 and put a 208 yoke on it so the u- joints will be the same? I am guessing that the deciding factor would be output shaft spines? :dunno:
     
  2. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

    Joined:
    Dec 20, 2002
    Posts:
    17,412
    Likes Received:
    3,799
    Location:
    Afton / Star Valley Wyoming
    Aren't 208s slip yoke output in the rear, and 203s are fixed yoke output in the rear? Just take the driveshaft that is in your blazer now have them cut the end of the 208 dshaft (the one that hooks to the axle) and have a shop weld it on to the orginal driveshaft. I think you have to shorten the driveshaft just a bit anyway don't you?
     
  3. mouse

    mouse 1/2 ton status

    Joined:
    Nov 10, 2003
    Posts:
    1,448
    Likes Received:
    0
    Location:
    Great Falls Mt
    I'm just running a conversion u-joint from napa.
     
  4. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    203 were in alot of 1/2 and 3/4 tons 73-79/80

    tons, coupel different size output yokes and u joints, some of the late 70s k20 and such had a coupel different sized yokes and u joints in the driveline from factory,
     

Share This Page