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dana axles and NP? t-case

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by txfireman, Sep 4, 2002.

  1. txfireman

    txfireman Registered Member

    Feb 23, 2002
    Likes Received:
    Abilene, TX
    sorry for the dumb question, but i am having trouble finding out how to distinguish between dana 44 and dana 60 axles and i also need help identifying a NP203 from an NP205.

    I have an 80 K-5 with 33's for the time being, a 4" rough country suspension, pro comp 3/4 turn hubs, and various minor things.

    PLEASE help!!!
  2. Calclips

    Calclips 1/2 ton status

    Apr 4, 2001
    Likes Received:
    Swartz Creek, Michigan/Flint while in school
    Easiest way to tell a NP205 is the small circle with three bolts in it on the back side of the case, a 203 is just huge and cast iron. Dana 60's only have 3 ubolts, that is usually how I tell.
  3. 77Jimmy

    77Jimmy 1/2 ton status

    Sep 3, 2002
    Likes Received:
    Atlanta, GA
    For axle ID, go to the Technical section of the coloradok5 homepage -- you should see an article on axle ID.
    For tcase info, try www.chuckschevytruckpages.com and click on Parts ID.
    Hope that helps.
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

    Feb 17, 2000
    Likes Received:
    The easy way to tell a D60 from a D44 is the D44 runs ball joints and the D60 runs King pins. If you look at where the fork where the knuckle joins next to the wheel the D44 will have a single bolt from the end of tha ball joint sticking up with a nut on it. A D60 will have a cap with a square base held down with four bolts.
    NP203 will have a tag over the front output. The tail shaft housing will be about 10 inches long and two peices . The main body of the case is in two sections.
    The NP 205 came in either a Slip yoke on the 80 up versions and fixed yoke on the 79 down. Looking at the rear of the 205 between the rear out put and the bearing suport cover for the front output will be a mid shaft retaing plate with THREE bolts holding it on. The fill plug on a 203 is in that location.
    too tell what tranny the case was attached to look for this.
    27 splies is a TH350 or possibly a 700r4. A NP205 for these is relativlye rare. 71-72 is the most common and all will be fixed yoke. 80 was also a comon year and the NP205 was the only case available on all models and options.
    32 splines will be for either a TH400 or a mid 80's up or so 4 speed manual.
    10 spline corse is for a 465 maunual from about 69-83 again the 80 up will be slip yoke.
    A 32 spline 203 is rare.
    A 10 spline 203 is vary rare. 74 only from most accounts.

    Slip yoke 205's can be converted to fixed yoke by replacing the tail shaft assembly and out put shaft. It's a bolt on off any fixed yoke 205.

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