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How to tell year of a NP241

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84CUCV, Feb 22, 2006.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    One friend said they are the same for al GM other friend said ther not. So i can i tell what year i have? as always thx for the help
     
  2. dleroy43

    dleroy43 1/2 ton status GMOTM Winner

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    one is pass side front output(89-91 blaz/ burb) rest are drive side front output. That is all I know of them
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    i know this one is from a 89 to 91, just trying to find out if they are all the same. thx for the reply
     
  4. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    This is from a MSWord file I have (from a forgotten source):

    NP241
    Type: Part-time, aluminum, chain-driven case
    Low range: 2.72:1
    Applications: ’88-2000 GM pickups, ’89-’91 Blazers, Suburbans, and Jimmys, ’88-’93 Ramchargers and pickups, and ’94-present Dodge ¾- and 1-ton trucks.

    In 1988 New Process proved that you could build a chain-driven case to handle serious torque. The NP241 is strong enough for your big-block–powered rig, and with a 2.72 low range (Mepco has a 4:1 kit) you can crawl all over your NP205 buddies. A heavy-duty version of this transfer case is used in the Ram 2500 with the snowplow preparation package, all Cummins diesel-powered Rams, and Ram 3500 dualies. This NP241 HD has provisions for a PTO. Be careful when shopping for this case as GM has an IFS version with the front output on the driver side and a solid axle version with the front output on the passenger side. Dodge also played this game when it switched to the new body style in 1994 and moved the differential to the wrong side.

    One final word of caution, the NP241 could use either a mechanical or electronic drive for the speedometer, so make sure you get one that will work with your speedometer or vehicle speed sensor (VSS).
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    You can sort of narrow it down.

    90-91 are electric speedometer, 89 is mech.

    If it's electric, no idea how to tell the two years apart.
     
  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    ok so i need a mech for my m1009. anyone know how to tell if i have a mech or a electric? thx mike
     
  7. btolenti

    btolenti 1/2 ton status

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    you'll need a 89 with the mechanical speedo for a direct swap.
     
  8. neverendingproject

    neverendingproject 1/2 ton status

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    sorry to hijack, but what is this 4:1 kit?
     
  9. afroman006

    afroman006 1/2 ton status

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    4:1 kit is I assume a new set of planetary gears to change the factory low range of 2.72:1 to 4:1. Mechanical speedos have a little screw stud with threads on the outside, electronic speedo has an electric plug.
     
  10. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    great thx guys!
     
  11. BIG*RED

    BIG*RED 1/2 ton status

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    IIRC...the jeep wrangler rubicon comes with the np241 with the 4:1 ratio...but its a drivers side drop
     
  12. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    thought that was a np231
     
  13. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    if its never been touched , I.E opened up , look for the little tag on one of the bolts . This has the year and other info on it .
     
  14. 84CUCV

    84CUCV 3/4 ton status Premium Member

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  15. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    looks like i have a newer one. Just need to get the parts to make it a mech. Worry about that after the sye kit is done. ths for the replys mike
     
  16. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    No, the Rubi uses the NVG241OR, NP241 w/ 4:1
     
  17. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    ok thx didnt know that
     

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