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NP241 behind my SM465?

Discussion in 'The Garage' started by Chris Demartini, Sep 22, 2003.

  1. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color="blue">I have an 81 SM465/NP205 in my Blazer, whats the easiest and cheapest way to put a 241 in place of the 205?
     
  2. BowtieRed

    BowtieRed 1/2 ton status Author

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    get one with adapter from an 89-91 blazer
     
  3. BowtieRed

    BowtieRed 1/2 ton status Author

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    if your 205 works, give me a month or two and i'll trade you.
     
  4. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color="blue">Shipping would suck, but the 205 is fine except for a front output leak.

    Seriously, whats involved in this swap? A 4:1 NP241 is a lot shorter, lighter and cheaper than a Doubler
     
  5. BowtieRed

    BowtieRed 1/2 ton status Author

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    if you have a ten spline SM465 nothing to it- get the 205 out, bolt up a new adapter and NP241 at once. . . you'll need something to hold up the tranny while changing cases as the xmember will have to come off, and maybe need a new one. shipping isn't that bad- i had a SM465 and NP241 and everything for an auto/manual swap shipped for $140
     
  6. sapper

    sapper 1/2 ton status GMOTM Winner

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    [ QUOTE ]
    A 4:1 NP241

    [/ QUOTE ]

    Are you talking about a Roctrac?? If someone is making a four to one kit for the 241 let me know, i would like one if its out there, havent heard of it so far.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    No NP 241 will bolt to a 10 spline tranny so that's not correct. NP 208 and 241 come in 27 and 32 spline only (thanks Rene) we covered this a few weeks ago.

    The easiest way to get a 241 to bolt to a 32 spline 205 is to get one from a TH 400 equipped truck.

    An NP 241 is not 4:1 either...it's 2.72:1. There may be a kit for it, though. I'm not aware because I think that kind of low range is stupid/useless for my purposes.
     
  8. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color="blue">I think I read in one of the mags recently that there is a kit. I know High Angle makes a SYE for it
     
  9. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    4:1 241's only exist in jeeps. they will not make one for our trucks because they can't get the planetaries to survive the torque and stress without doing some MAJOR work to the case. just buy an atlas if you're really wanting a 4:1. but by the time you buy an atlas, you could have bought a Doubler and had a selectable low range, as opposed to 4:1 all of the time.
     
  10. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color="blue">I dont want 2 heavy t-cases, or a 2:1 low range. I heard an Atlas wasnt recomended for fullsizes
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Well in that case, put lower gears in your axles then because you've just eliminated all of your options.

    One heavy case = strong but crappy low range
    two heavy cases = strong with good low range also with option of crappy low range

    Me personally I'm happy with my crappy low range but others don't feel the same way.
     
  12. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    Thought about a Klune V?

    The 5 minutes I've looked onto low gearing options, that's the one I picked
     
  13. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color="blue">I find myself needing lower gears all the time, even with an SM465 and 4.10s. I think the best thing to do would be to get 5.13s when I put a D60 in, that should work well with 38s
     
  14. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Atlas's will work fine on a fullsize. There's a few people on here that have them.
     
  15. BowtieRed

    BowtieRed 1/2 ton status Author

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    oops, idk what i was thinking, that's 10spline input SM465!! sorry, idk what i was thinking.
     
  16. Chris Demartini

    Chris Demartini 1/2 ton status

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    [ QUOTE ]
    Atlas's will work fine on a fullsize. There's a few people on here that have them.

    [/ QUOTE ]

    <font color="blue">Even so, 5.13s are still cheaper than an Atlas or Klune-V.
     

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